I think you could just let the models decide. You don't own them, do you?
O.K. I see where you guys are getting at. No I don't own them but here is the thing... I get turned down by 10 girls before that 1 girls tell s me yes. Im doing all the leg work for somebody else to just step in and say ; "hey I know so and so and... we should shoot together" Shouldn't every one do their own leg work. It's not always fun getting turned down.
Dude... as True said... "Get over it".
It's called networking and some day you'll be on the same end as this guy.
Who is to even say she will say YES to that one guy? And who cares if she does?
I'd be more worried about duder stealing your actual WORK... not shooting with a model that you shot with and somehow feel entitled to.