Yukari possessing the power to heal wounds (via manipulating the boundary that keeps a human being's insides from being their outsides) makes quite a lot of sense. It's almost a little too much of an easy way out for Reimu, though. Then again, training under Yukari fulfilling the role of the kooky (often lecherous) old mentor, complete with grueling and humiliating training routines, may very well prove to be struggle enough.
I can't wait to see what, or rather who's next. What's Marisa doing right now? One wide open question Perfect Memento doesn't elaborate on is who exactly the "most powerful youkai" were that ended up stopping the Vampire Incident. Let's see some Yuuka content!