I would say none. A Mt. Rushmore should be reserved for all time greats of some sort. We had so far some players who will be first-ballot HOFers but we have that every generation. We have some people who have won a Hart trophy or so, but so does every generation. There are a couple of players who may be a tier or two near, but no one clearly who makes it.
So you're saying the requirements (in your mind) are to do something that doesn't happen every generation?
Ovechkin:
1) 9 Rockets -> Never been done before. The closest was 7 by Hull when he won his 7th (retro) Rocket over 50 years ago. 2nd closest is Esposito when he won his 6th over 45 years ago.
-> Since Gretzky won his 5th almost 35 years ago, no-one has won more than 3 (Ovi has 3x that amount lol)
2) Nobody has lead the league in goals/gp, powerplay goals, or shots more times than Ovechkin. If you want to look at #2 in those aspects (which are still behind Ovi, you're looking at 40-50 years + ago)
3) Only 3 players in history have more Harts than Ovechkin (and those 3 all did it 30-80+ years ago). The only players to tie Ovi in this aspect all did it 25-80+ years ago.
Lidstrom:
1) Only Orr has more Norris trophies than Lidstrom, and Orr won his last one 45 years ago. The only person to tie Lidstrom with 7x Norris trophies was Harvey when he won his 7th 60 years ago. No one else has more than 5 (compared to Lidstroms 7)
Bergeron:
1) Nobody in NHL history has more Selke's than Bergeron, the only person to match Bergeron was Gainey, who won his last Selke 40 years ago.
Crosby:
1) Only 1 player all time has more Smythe's than Crosby (Roy), and Roy did that 20 years ago. If you isolated it to skaters only, Lemieux was the last person before Crosby to get a 2nd Smythe, and he did that 30 years ago.
Seems to me like the consensus of Ovi/Lidstrom/Crosby all have done something that has not been done in a long time (or in Ovi's case, quite a few things that have NEVER been done).