that's is why Cesc Fabregas is on the radar.
I would play Henry, Eto'o upfront, Ronnie behind the 2 but he could also thread to the right, Messi in the middle but could also tread to the left, Deco in between Messi and Ronnie, Xavi holding the midfield. It is possible to play all of those players, Eto'o and Henry are close friends.
If Eto'o goes to Milan, than you can say bye bye to Kaka. At this current time i don't know where they will get the funds to lure Eto'o. So the situation would be, keep Kaka and bring back Shevchenko, or sell Kaka and bring Eto'o.