If these guys are stronger than Gotei 13 put together and Yama's bankai can destroy SS itself, then wouldn't it be safe to assume each Squad 0 member could do the same (meaning the destruction of SS)?
Things could certainly unfold that way. Bleach is ending so the power inflation that occurs in battle manga should be applied soon by Kubo, just look at Naruto as an example.
However, the power gap between Yama and the rest of the captains was very large. He obviously made up the bulk of SS's fire power, meaning not all the Zero squad members need to be stronger than he was, their collective power needs to surpass the goten 13's which has some shitty captains.