@sethysquare: But he hasn't been a titan for a long time.
He was just before he joined the Justice League pre-Flashpoint.
Just like how Dick have not been a titan for a long time.
He was one just before Battle For the Cowl. He basically stopped being one when he became Batman.
Its like saying Dick is a titan, so he should never have been batman.
In this case we're talking about a person going into a new team, you're comparing it to a person assuming a different identity because of previous affilations. Not only is wrong, because its nothing of the like, but the comparison isn't related.
He should always stay a titan and never move to the justice league.
In one case he moved on to the Justice League, in the other case he became a founding father for the Justice League. What its like is saying that Nightwing is retconned as being a founding father of the team because Batman didn't want to be part of it due to all of his "loner" shenanigans. Much closer comparison.