"The sheriff doesn't ally with bounty hunters." (except Oakley)
"Oakley doesn't team up with others." (except Evans)
What he's suggesting doesn't make sense. If he's talking about bounty hunters collectively losing to Evans, teaming up isn't going to help (although coordinating might). If he's talking about every single bounty hunter losing to Evans, then teaming up doesn't make sense either, since then you're not a single bounty hunter anymore. Evans having help isn't an issue either, since bounty hunters also have informants, and it's not like Evans isn't the one doing the actual hunting work anyway.
Yeah, you don't match up to that team. If only they managed to team up in some other, more permanent way...