ah man, byakuya isnt looking so good :T_T: , getting pummeled 10 feet deep into a wall with senbonzakura is not something many people would be able to walk away from, he may be finished, but as others have said it wouldnt serve any purpose plot wise ,especially to kill off someone so well developed, so im inclined to think there may be some unohana intervention or something along those lines
and kenpachi showing up with all his OP'ness was pretty legit, its been a little while since weve seen him in an enjoyable fight [ ken/byakuya vs yammy was pretty mehh] so i cant wait to see how much hes improved in 17 months, he may possibly have a stronger eye patch to mask how much his power may have grown, id think that would be likely