Most characters here are better than who they're replacing.
Lector's not stupid enough to think he could stay on the planet and the Predator's would accept him, so he's not turning on his teammates just to get a kill in exchange for what would be suicide.
Mr. Blonde likely dies as he's unspectacular. Hannibal would only be useful as a thinker/problem solver, similar to how Royce was.
They clear with few casualties.