Jason being written by the fans who write and draw fan content with him will lead to him being in relationship with every male character he exchanged two words with including Bruce and Damian. Act as an edgy 13 years old who swear every second and cry on his pillow over Bruce being mean to him. Be a raging feminist and an obnoxious self-righteous who screams at everyone about his political views.
Short answer, Morrison's Jason would have been a mercy.
Because of the bat symbol. Having Jason return to his old costume after what happened in issue 25 and when him and Bruce didn't have their recollection yet would be extremely pathetic. By the time his old team returned, the book was in its way to cancellation and it was too late for them to introduce a new costume.
I still think Task Force Z is going to be a book and Jason will have a new costume in it (not that I would be upest if I was wrong because I would prefer for Jason to have mini books over an on-going). Whether it will have a bat symbol or not, it will depend on how things will end up in UL.