I think his head was a mess after TB released him, then he's supposed to play against the NYG under the bright lights of MNF a few weeks later...that's not easy. True, he played terrible, but he has the physical tools you want -- it's a matter of whether M3 could work with what's between the ears. The Internet rumors about that are all over the board.
Freeman can't carry a team on his own a la Rodgers. A team with some good supporting players and a coach who can figure him out could make noise.
I think they'll give Tolzien every opportunity to beat Flynn as top clipboard holder. Flynn's a gamer with experience in the system and respect of his teammates so that won't be easy.
Good to have Flynn back as a Plan B. Makes it less likely they draft a QB, especially early, but I wouldn't be shocked if they took one R6/R7 or grab a UDFA and put him on the PS.