Again, I'm not belittling his achievements. Why can't he do it the other way round? Go to a 'more modest' club, win trophies with them and then later on go back to winning with the biggest clubs.
For me, unless Mourinho does something similar, he'll always be a level below Ferguson, regardless of how many trophies he has won. Ferguson broke the stranglehold of the big two in Scotland, winning three of the four league titles they've won in their history. Won a European trophy against Real Madrid.
Then took over a club that hadn't done a great deal for a while, certainly weren't even close to being dominant in any way and built it up. Lifted the club back up, won trophies, revloutionised the club and the way it worked, everything.
You ever see Mourinho doing anything similar to what Ferguson has done? Or is he going to rotate between Europe's top clubs, picking up trophy after trophy but never really building a legacy?