I don't think Nolan ever unfairly didn't rate Forte, he just didn't show him anything that impressed him until his more recent run in the team which is why a lot of fans, myself included, didn't rate him until then either, he looked disinterested and moody for the first half of the season and wasn't worth his place in a team that was doing very well in the league. Since coming back into the side he scored a couple of goals and looked a different player, he ran himself into the ground most games and the change in his effort showed a lot imo.
You can use the excuse of him being played out wide but that's not an excuse for him to not give his all, Stead was fairly vocal in his dislike for being used out wide a few times when Moniz was here but he still put a shift in when he did it, you can never fault his effort and he generally gets the same "service" if not worse when he plays upfront.