Difference between inter 2010 and 2011 (except Mou - Rafa) is marginal, Cesar, Lucio, Maicon, Zanetti, Stankovic, Cambiasso, Sneijder, Etoo all playing majority of the minutes in both seasons. Milito, Samuel and Motta missed more time than season before, but Cordoba, Chivu and Pandev who played a lot previous season were still there. Its more or less the same team. Everyone expected them to win. Meanwhile, if you take Milan 11 vs Milan 12 and compare them, starting XI based on minutes played looks like this (Pirlo and van Bommel started half a season each in 2011):
Abbiati 35 starts/Silva 33, Nesta 26, Abate 29, Antonini 18/Pirlo 12-MvB 14, Gattuso 28, Seedorf 23/Pato 26, Robinho 19, Ibra 29
Subs: Boateng 18 starts, Flamini 14, Ambrosini 16, Zambrotta 15, Bonera 15, Yepes 11
Abbiati 31 starts/Silva 27, Bonera 17, Abate 29, Antonini 17/van Bommel 22, Ambrosini 17, Nocerino 33, Emanuelson 17/Ibra 32, Robinho 21
Subs: Nesta 16 starts, Aquilani 14, Boateng 15, Mexes 13, Seedorf 14, Muntari 13, Cassano 11, Zambrotta 10, Yepes 10
Now compare each teams best possible lineup with the ones that played majority of the time in those seasons. People remember the high profile names but dont remember the bums that were on the pitch for so many games for Milan. In reality, Ibra/Silva were carrying a mix of mediocricity and retirement home has beens on 3 fronts and stayed in all 3 close to the end. inter in 2011 was by far the bigger disapointment