No question, Sabre.
In fact, I think Xabi's one of our most assured tacklers. He gets stuck in good and proper! In another thread a few weeks back someone (can't remember who) made a great comment about the number of pinpoint, goal-saving tackles that Xabi makes in his own penalty area. The commentator stated something to the effect of seeing the player make the tackle, looking closer expecting to see Carra's number, and then realizing it was Xabi!
So, I certainly didn't mean to suggest that Momo does all the work of breaking up play in midfield--that's a key, if rather unsung, part of Xabi's game too!