The manager should work for both parties - for participants and for developers - this is how works Rig4hodlers.
I fully trust him.
I don't know whom yoy have mentioned but that's true. Bounty managers must have to be for both of the sites. I barely have seen a manager who cares about participants after bounty end. One of them is wapinter, after ending the bounty, he don't give a fuck to the participants. Bounty manager should be helpful.