My theory is that Vegapunk is being forced by the government to work for them and that he has been working with Kuma in secret to help whoever is most susceptible to overthrow them.
Which now would be Dragon, and therefore his son too.
As for Doflamingo he probably has the Ito Ito no mi and is...
Oda likes to have a all the norman men in the SH crew as tall as each other and Nami as well, Luffy Zoro Sanji Usopp Nami are as tall as each other.
+ They're already 20 or more (Oda hasn't really been 100% precise on that) and not everybody grows that much.
Plus you have to remember that Luffy...
Says who ? Have you seen the extent of his power in the drawings ? I didn't.
And btw Garp was VA by choice, otherwise he could easily have sat here Sengoku was.
I just realised seeing the poster, how Oda wants us to see Zoro and Luffy as a pair just like Roger and Rayleigh were !
They're basically clothed up in the same way while the rest of the crew isn't. Clearly Sanji is strong, but I predict that Luffy and Zoro are just on a whole other level. I...
So, anyone else thinking Sanji has the death wink on the other eye :D ?
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He probably forgot their smell, or thought they changed, as simple as that :D