is flashback deliberately getting left out or is he still on leave
I would assume he's still on leave UNLESS if whenever he came back, Termi gave him a lecture and told him he won't play this match since Termi seemed frustrated in his interview after the BOOM game.
Flashback has to have a good reason on why he decided to take a leave of absence because there's no way the team is ok with him doing so.
He asked for "personal leave" two days before the BME game and proceeded without any discussion. So DRX had to sub in Beyn and since playoff is in the near future, i doubt Flashback will join in once he is back.
The only official facts we know are:
Fb took a personal leave 2 days before vs BME
Coaches got taken aback by sudden leave
Beyn subbed in.