I think svens looked at our strike option without rooney and owen, and decided that we have a better chance of scoring with a 4-5-1, i agree with him personally.
It allows for much more flexibility, he could go for an attacking 5 such as...
downing cole lampard gerrard beckham
or throw in carrick / jenas to tidy it up a bit. Thats also allows for lennon to do some damage down the flank if downing or cole have a bad game.
Also remember that walcott can play on the right wing...
I personally believe that owen will be 100% fit, which means he can play up front with crouch on a 4-4-2, or go by himself with a 4-5-1.
I'm impressed with sven on this one, its a team with pace and power, taking risks rather than hoping defoe or bent can knock it up a notch, which poersonally i dont think they can. I do wish SWP was there but if he's not been playing, and by the sounds of it he's not even been playing well when he has got a game, then he doesn't deserve a spot.
But then again neither does campbell and he's still going....