The DMs have to do much less though. It's alot easier to get the ball in midfield and being able to pass it to 3 players in the 'next line' if you will, than just having Diego infront of you.
If it's just Diego you will have to look for other options, like getting the ball to the strikers yourself, which they really can't do. You would need fullbacks to cover the sides, which they don't. Options are just fewer and more difficult, which is where things go wrong with our current DMs.
Besides, Melo and Momo were excellent when they just formed the '2' in that formation. I thought it was worth a shot a while ago, and I think it's definitely worth a shot now, if you look at our performances.