He would, I think. He outranges gross by enough that he would get his attacks off before gross, and as long as you stack enough cyborgs and dragons + don't use close ranged cats, you would probably knock back the gross before he gets a wave off.
Eh, maybe? Add sexy/macho legs, valkyrie, maybe bahamut, figure skaters, any solid long-ranged ubers, surfer, and you'll probably be good. C Gross doesn't tank too much before he gets kb'd, anyway. If that doesn't work you could always try to spam jamiera and ramen to tank the waves + do good damage, though i'm not sure how well that'll work.
I'd recommend on focusing on your most coat efficient for their dps units. Combos are also an excellent idea. With research combos or cool jap, camera spam should be able to nearly just deal with the stage without support. Ofc if you have any wave blockers or immunes they'll be a massive help, as would abaha. Legs, surfer, drama, and dragon are fine midrangers to bring as well, but not as op here as abaha/wave immunes.