I don't think many strikers could actually play Dider's role alone upfront. Take Crespo for example, he's one amasing striker with another central upfronter but on his own he can't get many goals. I you brought Adriano, Sheva and Henry to Chelsea with the system we play I don't actually think any of them would score more than about 10 goals in the Prem. Given the chance to play in a 4-4-2 for a season I think Drogba could come in the top 2 scorers, in my view he is just that good.