I stop arguing with you, this going nowhere. Basically because you go around, therefore it will be endless. Just to finish as a proof:
You say few, I put almost all the fighters.... basically there are only a couple of fights he won despite being weaker. After that you say:
Yes, you said only a few he won on his own, I showed you the contrary.
We are speaking about the fights he won, why do you bring on the table the fights he lost? I specifically mention the fights he WON, this is what we were talking about. There is no need to argue if you change the subject.
Same than with Holt; it is your opinion. Good, it can be. But do not state it as real facts. We do not even know the extent of Luffy's strength at the moment, since he has not got a real fight in ages. As Holt said, Luffy wins sometimes even if he is weaker. That was the case with his first Shichibukai, you can expect him to do the same with his first Yonkou. He did not last against DD because he was careless, typical of him, let's wait to assert things here again.
Do not use the 30%, Law included it as the chances of strategy and since all he said was lies, this could be totally untrue. The goal was not Kaidou but DD, chances that he has been to Dressrosa before and so on. He had to be credible to hope Luffy will go with him according to the plan.
Moria dared to fight Kaidou, Crocodile dared to fight WB....
You're right this is getting nowhere, because it's mostly assumptions from your part. It's ok we can all make assumptions or theorize about stuff in OP, but since there is no way to be sure yet, it's best to trust what information has been given to us by numerous characters in the manga.
For starters the Yonko are considered la creme de la creme of pirates, or simply put the strongest and more influential pirates. They control the NW and even the Shichibukai aren't exactly willing to take on more than one Yonko at a time. We can deduce that from Mihawk's reaction to Shanks arriving at Marineford(although it's possible there is another reason behind that). Another proof would be BB not willing to take on Shanks and his crew even though he just acquired the strongest DF shown in the manga, WB's DF.
The Yonko while not being prone to directly confront each other, were shown to do this twice. Shanks vs WB(the WG were shitting their pants when they both met) and Kaidou going after WB only to be stopped by Shanks. If the WG is just afraid of Shanks and WB meeting then you can make an idea for yourself about how strong those two are, and Yonko in general.
Besides having crews and alliances that can easily be numbered in hundreds, the Yonko themselves are supposed to be pretty strong, just look at every example of a Yonko in the manga(the ones that were shown). The gap between WB and the commanders is huge, same for BB and his other commanders(I guess we can call them that) and I wouldn't be surprised if it was the same for the rest.
WB was called the strongest man alive, and Kaidou is called the strongest creature, and BM is the strongest woman. Seeing how the former(WB) was indeed the strongest man, I think it's not an exaggeration and those titles actually reflect the reality.
During Marineford, the Shichibukai didn't face WB directly, for the exception of Mihawk launching an air slash at him. This could hint to them not being able to fight WB directly because they don't stand a chance, and seeing how Crocodile was a Shichibukai and he may have lost to WB in the past it's not hard to see why the Shichibukai are relunctant to face the Yonko.
Kaidou is most likely a Zoan type user, or just a beast(not human).He could be a Zoan because he's crew has a lot of them (500). With that in mind it's not hard to conclude that he'd be terribly strong just looking at how Rob Lucci was incredibly strong when Luffy faced him.
So everything points to Kaidou being feared because he's a Yonko, and because he's supposedly very strong(title). Anything else is pure speculation at this point and it would be ignoring every information that has been given to us .Also it is not realistic to think that Luffy is stronger than the Yonko at the moment. It's not like that how the manga works. To me it was evident in the first part of the manga that Luffy got stronger with each enemy he fought. Also Luffy always loses the first rounds, but makes a come back in the second or third round. Why's that? Well Luffy's greatest strength is his endurance, he's able to fight even after sustaining a lot of damage, he was exhausted after ID but he still fought in Marineford. Morever, he always pushes his limits and fights even when he's about to die (of poison for example). When entering a fight Luffy is always the weaker one, at least on paper. If it wasn't for obvious weaknesses(water for Crocodile, lightning being ineffective against rubber for Enel) he wouldn't have won so easily, and in fact he didn't because he still sustained a lot of damage. And a lot of his opponents end up underestimating him so that plays in them losing too. My point is we need to see Luffy level up as they sail in the NW, just like we saw him level up in paradise, so it is not realistic to think that as of the Dressrosa arc Luffy is already stronger than the Yonko, because that would be discarding everything that was previously established in the manga, and we'll prolly know for sure once Luffy fights DD for real.
The challenge with the Yonko, other than them being pretty powerful individuals, is also the fact that their crews are huge. Kaidou has 500 Zoan type users, and he could possibly have more crew members that aren't DF users, or not Zoan. Seeing how Luffy had such a hard time to deal with Lucci alone, do you really think things will go so smoothly? And just look at the mess that is Dressrosa. Law is right even with their alliance they wouldn't stand a chance against a Yonko's crew in its entirety, because I doubt that Luffy could just waltz in and face Kaidou directly.
Your assumptions have not much substance to them if not at all, or at least not more than what has been said by Holt and other members.
So yes I believe he is not, that Shanks among others is stronger than him. But no evidence of that was shown and no arguing possible on this basic opinion. 
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