Warburton scored plenty playing in the hole behind the point attacker too. Lloyd scored plenty playing wide left in the same system. Thomas has scored a few coming in from the right as well.
All four of these positions are forwards in this system, and all four can and have contributed goals when we've played effective football. We aren't playing effective football right now.
4-4-2 or 3-5-2 or any other formation that ends with 2 would not change the fact that right now, those players, are not playing their best football. Why that is is anyone's guess but I would suggest that perhaps the takeover and announcement of imminent full time status might have something to do with it. In the same why Salford went off the boil in the North the season they announced they were going full time the following summer.