This will be short n sweet were fixn to go shopping..
One thing to consider when rescuing males is most of the time they aren't neutered, which can pose some problems when trying to introduce 2 male gliders.
So that is one thing to consider, then there is the added expense of getting the new one neutered if he is intact. So when considering buying new gliders that's a couple of things that weigh in for me.
I haven't had male pairs but I do know male colonies can be successful for me it's just that Simon needed a new home when we adopted him and he came to us already neutered. I didn't really have a gender preference when we got him though...