If you removed the 1st and 2nd best playoff scorers from the 2009 Capitals (Ovechkin, Backstrom), you're left with Semin, Green and Fedorov. If you do the same with the Cup-winning Penguins (Malkin, Crosby), you're left with Ruslan Fedetenko and a 38 year Bill Guerin.
Ovechkin had the supporting cast and no amount of revisionist history can change that. I have no idea why many Washington fans like to push the false narrative that the Capitals weren't/aren't a very good team, outside of Ovechkin. The idea that Ovechkin doesn't play with elite talent is so ridiculous that it defies words, especially when he has played with a Vezina winner (Holtby), Norris nominees/caliber defensemen (Green, Carlson), an elite sniper (Semin) and one of the very best playmakers of his generation (Backstrom). I've actually had a debate with several Caps fans on HFBoards that their Cup-winning roster was underwhelming, just because the pundits didn't pick them to win the Cup during pre-season projections, even though they had just come off back-to-back President's Trophies. It's a nonsensical narrative but it still has it's proponents.
Personally, I was incredibly happy to see Ovechkin finally win the Cup and it wasn't because I felt that his supporting cast had vastly improved. Instead, it was Ovechkin who had grown so much as a player (especially under Trotz) that he showed he now had what it took to lead a team to victory and win it all.