There's a blogger out there who is basically a mathematician and not really a football fan in the sense that he is more interested in the numbers and statistics than in the game itself. He created an algorithm that rates players according not to their stats like goals or assits, but ccording to what this blogger calls "Goalimpact". It basically measures the average goal difference of a team with and withoutthe player on the field. The better his team performs in terms of goals difference with the player on the field compared to how it performs without him, the higher his "Goalimpact".
The guy himself says his "GI" doesn't necessarily reflect how good a player is individually and that it can always be improved, but I think he's on a pretty good track with this thing.
Point is: Not only is Müller's score of 217 the highest "Goalimpact" in the world by far (the average of all players is always 100), it is actually the highest in the history of world football (as far as the calculator's database goes, at least. Puskas is #2).
Tells you all you need to know about Müller. If a game is truly important, the more Müllers you have the better. It also mirrors what Badstuber, who played alongside Müller in Bayern's youth teams, once said about him. Paraphrased, it was something like: "He was never the best at anything or the outstanding player in the team but in practice matches, the team he played for always won, no matter who he was playing with."
Just thought you might be interested.
http://www.goalimpact.com/p/blog-page.html
http://www.goalimpact.com/2015/04/top50-football-players-april-2015.html
Oh, just to say it again: This deal won't happen.