Yep. Dealing with killer beee would be the only true problem, but as long as he gets poisoned before he TBB, I think he can win. Held down with gaaras sand and pumped full of poison, anyone will go down.
Thing is, Bee is starting to show some more abilities besides just hella TB skill but you're probably right, although should he transform while Gaara is messing with the sand he could just TBB Gaara and his sand and that'll be the end of that, or go straight for Sasori. I feel if poison was taken out of the picture then it would be more difficult for them.
Also we have to take into account the Bijuu's rapid healing of wounds, we don't know if that would extend to poison neutralization. We don't have any real solid evidence but it wouldn't be unrealistic if you think about it. If Gaara's sand can keep up with KB then yeah, but we have to take into account Gai who could rape Juugo in a fair amount of time and the Mizukage is a very powerful (I mean, that's what can be expected since she's a Kage and hopefully we'll see what she can do) I feel maybe she could cause problem for Sasori but deff more info on Mei will be needed for her active participation in this match.
It's difficult I'm still on edge a little.