This is probably the second best Xyz in the volcano box, second only to Vylon Disigma.
Everything else have various issues, like being a Rank that's currently harder to summon, or in Basiltrice's case, very good but too counter-able before it can become very good.
This is not the second best Xyz monster in this box. Sure, the higher ranks are difficult to summon but some decks don't have trouble to bring them out. That's why those Xyz monsters are better.