If he genuinely has the ability that his early form suggested then he could be an absolute gem of a player. Indeed, if all he was lacking last season was fitness and confidence, I'd be tempted to build the team around him. You don't necessarily need pace, particularly when you have a cultured left peg like his.
Looking at our squad just now we have a bit of depth in defence and midfield. Therefore 352 could be the way ahead. If Forbes was to play behind the 2 strikers he could be dynamite.