He's kinda like Eve, except while her issue is trust, his is pride. He's not likely to join either side right out the gate because he feels that it would be demeaning of him to join a group, which is the same as accepting help to him. The only reason he'd join a side is if one side pissed him off bad enough or if he made a rather good friendship with somebody. He's likely not going to join Homeworld, however, as Bloodstone demands obedience that Mars just isn't going to give.