Ovi usually serves those since he doesn't kill penalties anyway and he can be sprung on a pass as he gets out of the box... lots of teams do it with their best players.
Most teams' best players are 2 way forwards. Ovechkin really isn't - he's a rare scoring talent, but not a two way player.
I wouldn't say that most teams best player can't play on the PK. Nothing against Ovechkin, but that is why Crosby is better. And I hate saying that as a Flyers fan.