Of course they weren't gonna win it. Inter won it on great tactics and there was absolutely no space for Zlatan in those tactics.
This Inter was rather poor until they bought Pandev and Mourinho could implement his tactics. If you remember, they were doing worse in the league than usual and in CL they sucked in the group stages. But players, not necessarily of world class quality, make the team better sometimes.
For example, do you think Inter would have won the CL with the same 4-3-3 tactics with Pepe instead of Eto'o? They might have, no?
But do you think they would have won it if they played 4-4-2 with Del Piero instead of Eto'o? I bet my right arm that they weren't.
Is Pepe better than Del Piero?