Point 1:Yes, he did leave, but to have him back like I've said before at the right price I wouldn't say no to.
He left because of his wife, who wanted to live the London lifestyle, now she knows how $hit that really is (no offence Mike!). Yes he did kiss the Chelsea badge but he immediately after the game apologized to the AC Milan fans how many players would do that???
This guy is something else, or have you all forgot the goals, the assists, the runs, the skills, the pace, the effort and the heart Sheva contained and blatantly still does for Milan. I'm not saying I expect him to be treated like a king not for the first few months anyway until he proves himself to us again.
Point 2:I think the main reason a lot of people are saying no to Sheva is because they want Ronaldinho in this team, the only major impact of having him in our team in my eyes is when you're down the pub with your mates you can say "yeah but we have Ronaldinho in our team". Someone was mentioning above about stars in Man United's team and how they rely on CR if we have Ronaldinho it will be like watching C.Ronaldo but an older/deteriorating version, we simply do not need this guy.
At first I thought wow Ronaldinho? That would be great, but when you look in reality if he does leave he will become the most expensive player in world football. We already have Kaka who's better than him (people unbiased would say that now), this would issue the message to Kaka yes you have scored 10 in 12 but we still want to sign the guy with the fancy name, great moral boost that would be.
We wouldn't be able to play the way we play with Ronaldinho in our side, we have a team of hard workers not one-trick show ponies and that's what makes Milan what Milan is! At this moment in time I wouldn't swap any of our midfielders, not even for one of the 2 Ronnies!