Vander Decken IX
I do believe that she is just boasting. It can't be that sword attack from an actual average or a bit higher than average swordsman from Grand Line won't work on her and the same goes for a huge axe as Dekken can literally throw anything. He can as well throw tons of arrows at the same time and I don't believe Alvida will be unharmed after getting tons of arrows from all the directions...
Her skin is smooth now, but when you are hit with something sharp it doesn't meen anything as you will get cut anyway, maybe a bit less, but still as the property of your body doesn't change. You aren't tough like steel or rock, you are just smoother than a normal human body, but you are still the same flash. The same goes for punches. If someone strong and with a considerably big fist attacks Alvida it won't slip as it will cover her entire body... For example Luffy's Gear 3 Gigant Pistol... it just won't mis Alvida.
Her DF might be useful against useless persons, but not against higher than average opponents.
Yasopp win. Shank crew is no joke
Down to three, the mer prince is out. Van der decken's DF can be very effective.
I believe that this group is quite weak overall. I believe the ones who should win are:
1. Yasopp. He is obviously the strongest one without any doubt and is as well a great sniper with tons of experience, thus I believe he won't have any problems taking both van der Dekken and Ryuboshi at the same time.
2. Van der Decken. He seems to be overall stronger than anyone of baddies exept for Hyozou before NFP used their drugs. As well we should take in consideration that his DF is quite fearsome as he can target you with tons of objects that you can't block or redirect at the same time. Even if they are not that big or dangerous by themselves individually, but if you are hit with like two or three knives or daggers or arrows, then your mobility gets lower and you are bleeding as well, thus you will fail to block the next attack.
Sj I believe Ryuboshi will loose in this round, while the other two fighters will advance.
Ryuuboshi is able to knock out sea beasts with Merman Combat - who knows if Vander Decken is? So far he's been shown to run away from Neptune Army soldiers.
I agree that he was mostly running from Neptune Army, but he was not only running from the weak soldiers, but also from Fukaboshi and his brothers as I agree that he can't take three of them at the same time. Still I believe that Van der Dekken should be capable of worning out Ryuboshi as the fight will be as it seems on land, then I believe Ryuboshi's mobility would be limited, while Van der Dekken as a Fishman would have a physical advantage on land as they sem to be several times physically stronger than normal humans. And his attacks will be quite effective as if he sends tons of sharp things on a good speed, then I doubt Ryuboshi will be able to block or deflect all of them at the same moment from different directions.
The only flow of Dekken's ability is that he needs to touch his opponent to perform his ability, but since he has an upper hand in mobility, then I think he can manage to do this. We should also take in account that he was quite capable to keep his counciousness after being slashed by Hodi with an axe and we know that Hodi was damn powerful at that moment.
Thus I believe Dekken can win a fight, especially since it seems to be hold on land.
Yasopp Vs. Decken wouldn't necessarily be a straight, comfortable win for the legendary red hair pirate. Like weixiaobao stated, decken's devil fruit ability could actually be a problem for Yasopp. Imagine if Decken did get a touch on him (lolz); it would be quite a struggle to both snipe him down while dodging whatever crap comes your way be it weapons, buildings or another kind of object. It would be a funny fight to see.
I still think no matter how effective or useful decken's df ability would be in this situation, Yasopp would definitely defeat him to make it to the next round. =D
I don't think van der decken can defeat yasop,who is a strong pirate under the emperor shanks! and ryuboshi should be stronger too.