Yes, it sucks when you have a group of people like that. However no one person is deserving of these mobs over the other. The only way you or anyone will be guaranteed to get the mob is if you actually actively hunt them yourself/establish a hunting LS (using the spawn time tracker on various websites like Ariyala etc )

Personally I think SE should have implemented the hunt mobs not be target-able for a time after they spawn (Something like 1min-5mins) However then there is the problem that the Mobs or your PT members become hard to target due to the amount of people around...