Xavin was/is a much more complex character, addressing real world gender identity exploration through a science fiction and fantasy lense. I found BKV's inclusion, and Whedon's subsequent follow up to be both courageous, controversial, and compelling stepping stones to bring awareness to such complexities and prejudices both in and out of inclusive community mind frames.
It's a shame Xavin is not being further explored, especially among a team like the Young Avengers, being such a positive example for diversity in all forms -- gender, sexuality, race, creed,etc.
I really hope that Marvel proceeds with another YA installment soon, despite what I can only assume were up impressive sales reports for the Original Sins offshoot.