He doesn't need a sidelining at all,all he needs is common sense to be brought back when they'd are using him.
About the Teen Titans,I HOPE it's that old Hulk trope where he is blamed for everything wherever he goes,and the Titans need to figure it out(maybe Manchester or star labs is behind it),and stand with him.
What DC should have done is
1- when they showed lex in kons brain,and teased as his human donor they should have stuck with it.
2- after they put him in Kals suit to heal him,they should have kept his TTK exactly like it was in the suit when he took it off,would have made sense that the suit healed him that way,and his powers would have been more tactile.
3-stop trying to make him into the ultimate oddball loner alien type character,make him embrace being on the planet and being a human,show him having fun again.