Just like you, I think Bayern Munich will be the leader of group. I agrre with you Manchester United still has a chance to finish second in the group. However I don't think Manchester United will win their remaining four matches. For Manchester United to be second in the group, Copenhagen and Galatasaray must make a lot of mistakes. I think Copenhagen and Galatasaray will not make that many mistakes.
I agree with you strongly, Bayern Munich has the best chance to lead the group with the highest point current in the group. If they win their next match against Galatasaray they need no much effort again to be at the next stage of the league and I'm very optimistic about that as Bayern seem to be giving so much to making sure they get it right at the champions league.
Manchester united have a chance to be second, but that is so slim and almost close to impossible, because it will take them to win all four matches which is a 50/50 chances of happening, and the current status of Manchester united does not show they have that form to win all four matches back to back as Galatasaray is not wishing to be kicked out at group stage.
Playing to become the second position in the group with no point at this time will be really difficult except Manchester united will have to rotate players in-between the premier league and the champions league in order to keep them fit and strong enough to perform and give the results they need to be at the second position,if they dedicate more energy to the UCL for now and reduce that they put into premier league, they could get that results but sadly they are not doing well enough at the premier league to take such risk.