To me both of them seem more like bi than anything else. But just because someone seem to be one thing or another it´s not necessarily so. Just look at "The girl in question" or the Buffy comics. But granted neither are especially butch/macho.I don't see how anyone could see either Lorne or Andrew as straight.
Which person is right for Lorne?
I always saw him with Fred 😉 they just jived so well together!