Wawrinka won his slams beating the World number 1 Djokovic and other strong players like Nadal in 2014. Murray won his Wimbledon beating the likes of Tsonga and Raomug. Djokovic's main completion was his pigeon Murray and a geriatric grandad. He can't beat himself.
What about the likes of Roddick, Baghdatis, Nalbandian and Phillipousis, are you going to talk down your idol for winning most of the slams during his prime against the likes of them? God forbid Murray doesn't face against 2 of the best ever players to win a slam!
Besides it's not like Andy beat Djokovic for his first two slams, oh and beating him and Federer both in a row at the Olympics right?
As a big Roger fan you should be fully aware of you can only beat who is in front of you