[Theory] Shanks' True Strength; The Red Hair Pirates!! The Strongest Crew!

[Uzumaki Macho]

The theory is just about Vista. I found the connection to Yasopp that makes the guy's theory even more plausible.

I don't remember BB ever saying they don't trust Shiryuu after the TS. Shiryuu not being one of the original members isn't a valid reason since you don't have to be one of the first members in order to become the right hand man. For example, Sabo is Dragon's right hand man, even though he joined later than some of the other members. Also, I think he relies too much on character design for evidence in this theory. Shamks and Whitebeard were enemies, so Yasopp and Vista could just hold a grudge against each other because one of them could have just injured the other or something like that.