100%. He may never come out and say it publically, but Marty knows deep down that this 7 game \ 6 start stunt was a gaffe.
April 13th of last year.. with a victory against the Bruins, and a soldout Rock chanting his name as he waived goodbye. That should've been his last game. That's how it should've ended.
He wanted to keep playing. That's what he cared about. Is he upset that it didn't work or he didn't play better? Probably, but there is no way this was a gaffe for him. He got a chance to take the net and run with it for a top 5 team in the league. That's all he could ask for.
From everything he has said 100 times, last year was an awful season for him, and not one he wanted to end on.
If it was, I don't think he is retiring as a Blue and joining their management staff.