Well at least I'm not the only one who said they were small fry. Barragan thinks so too.
I think even a vice captain (and as I remember not all of them are) can't beat a fraccion without bankai, which I doubt they all have.
And it makes some sense that some of them might lose. Just because the numbers don't add up. If the vaizards are on the side of SS and fight against Aizen too (would be found if the split up and both sides would get some vairards), we'll have a lot of good guys against a few bad.
"For Feanor was made the mightiest in all parts of body and mind, in valour, in endurance, in beauty, in understanding, in skill, in strength and subtlety alike, of all the Children of Illuvatar, and a bright flame was in him"