Ok I understand how this is supposed to work but come on man, I mean really??? Two captain level Vizards go bankai and get smashed by one sternritter who hasn't even used Vollstandig yet. Talk about gaps in power!
But wait, there's more! Then Vice- Captain Renji arrives just in the nick of time to deflect a captain killing beam with his zanpakuto, all while just in shikai no less.
My question is, if the zero-squad training was that beneficial, why not take a few other captains, or vice's along to gain massive powerups as well??
Bam! No more Quincy problem!!