Well you could make the argument that he was lucky enough to have a great team around him that could stay competitive without him in the lineup. If the circumstances were different, he wouldn't have had those same opportunities.
I'm not sure what that has to do with Ovechkin being a better player than Malkin though.
The issue is we are faulting Malkin for not playing in the regular season when he had nagging injuries as being "not better". That doesn't really match up to me.
If we want to say Ovechkin was more important to his than Malkin because of Malkin's injuries. Sure, solid argument. But Malkin's skill as a player shouldn't be effected if he took off time in the regular season.
If he was consistently missing the playoffs, I'd get the argument given he wouldn't be able to demonstrate his worth in the highest level of play, but Malkin has pretty much played every series the Penguins have been in outside of one in 2010-2011 and has played the same amount of games.
Also, if we are going to fault Malkin for that. Shouldn't we put weight in Ovechkin being healthy in multiple seasons where his team missed the playoffs?