These guys are tasked with infiltrating the Justice League posing as hero, they must kill all its heroes 1 by 1 without getting caught ,batman has Cis for plots sake. Who can do it?
I mean, I'm not sure anyone could actually do it (depends on the League etc) but Surfer would have the best chance as he can actually be subtle with his powers and disguise his efforts to take them down. He could actively not use some of his powers when heroing about then use these in secret etc.
The other three basically have to brute force people down which is a terrible way to go about that plan with the JL.
A fully competent Sentry should be able to. If he wiped the minds of all earth's heroes about his existence then he should be able to accomplish this. Also given what he did to molecule man he doesn't need to use brute force.