In answer to the OP, yes I think we do need another striker.
RL - unrealistic to expect 46 games
DC - unbelievably optimistic to expect him to go without injury for that long, plus even if fit he is 34
LB - currently injured, and then theres his court case
Forte - no, I don't see him being up to this league
This means pushing AL further forward perhaps, or relying on Guly.