Would this be hand to hand, or with light sabers? With his fists, Angel would have the advantage unless Andrew could bob and weave, float like a butterfly, sting like a bee, and reach out to the Force. If he could drag the fight out, Xander's excess lard would be his downfall in the end.
With light sabers, Andrew is by far the most experienced Jedi Knight, so Xander wouldn't stand a chance.
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Oops! In my comment above, I of course meant "With his fists, XANDER would have the advantage, not Angel. Sorry about that,