If he grows even more resolve and brains (without Yahiro around, but who knows), I won't mind him getting his powers back. I'll increase his flexibility to exercise some badassery.
Haruka could always just give Shu his power back. He got it from a vile anyway - and last time I heard there were a few of them (the number six comes to mind).
So who wrote this one? xDThey really need to give Ayase a new Endlave. She didn't get to use her new legs too much. This series feels like it is written by three people at different times. The normal guy (who is mediocre) does most of the episodes, a 14-year old nephew (who writes the really shitty contradictory episodes because it would LOOK SO SUPERCOOL!), and a third guy who should have been writing all along, because he has to fix what the second one screws up so that the series can make any sense at all (maybe 3 episodes).