Ok, so Mandalore gives the Basilisk Momentum. While strafe attacking, are you also considered adjacent when you are on top of a small, medium, or large figure?

Absolutely! Probably the only reason why the Basilisk+Mandalore combo is as decent as it is. The Basilisk is only so-so as it is, and if it couldn't use the Momentum bonus there, it would be much worse.

yeah, just wish it had some defensive capabilities....because it is an offensive nightmare if it gets in close.