Yes, and ordinarily I'd agree, but if he gets injured and then misses the season like Fabregas did where would that leave us? Getting into the SF isn't the goal is it? We still need to beat the frenchies (which isn't a foregone conclusion), and then there's the little matter of either Inter or more probably Barca.
Even with Rooney the CL seems a very difficult prospect.
At least with the league there is a good chance if Chelsea slip up we can capitalize if Rooney is fit. Put it this way: I'd love to see Rooney start, but i'm afraid that we might be risking him too early and end up losing both the tie and the league as well.