All 4 of the centers listed in the title....if you brought them back today, in their prime, they'd be the top 4 centers in the game. And it wouldn't be close. People would be arguing about which one was the best center in the game today and no current center would even be in the discussion.
Of the 4....I'd go with Hakeem. Shaq could be dominant, but the free throw shooting has me go with Hakeem.
Ewing was awesome. His main problem was that he was in the same division as Michael Jordan.
Lmao, Ewing in his prime wouldn't hold a candle to even Moses. Moses won 3 MVPs and led the NBA in rebounding 6 times and his team SWEPT Kareem's Lakers in the NBA Finals and then won Finals MVP. Ewing has never won an MVP, never won a scoring or rebounding title, never NBA Defensive first team (because he was too slow); basically Ewing has nothing to show for in his career except NBA First Team 1x which Moses did 4x, Hakeem 6, Shaq 8, Kareem 10x, etc. But NY Knicks all time scoring leader (lol)! In his era, he was a 2nd tier elite center and that wasn't just "because of Mike and the Bulls". It was because he was a slow, lumbering guy who could score at a good rate and occasionally block a shot. Hell, he never even finished in the top 3 in MVP voting, ever.
Even VORP (Value Over Replacement Player) metrics show that Ewing is beaten by his peers regarding total value vs other players in his era.
http://www.basketball-reference.com/leaders/vorp_career.html
VORP says the list should be:
*Hybrid PF/C
1) Tim Duncan*, 86.92
2) Kareem, 86.03
3) David Robinson, 80.88
4) Hakeem, 77.15
5) Shaq, 73.97
6) Dirk Nowitski*
6) Pau Gasol*
7) Ben Wallace*
8) Chris Webber*
9) Elton Brand*
10) Vlade Divac, 45.28
11) Horace Grant*
12) Moses Malone, 43.28
13) Jack Sikma, 42.00
14) Bob Lanier, 41.94 (should be much higher on this list since stats before 73 are missing)
15) Robert Parish, 41.47
16) Patrick Ewing, 40.93
So there were at least 8 other true centers more valuable than him via VORP, and that's not even including Wilt/Russell/Mikan due to certain stats missing from those eras. So he's most not even a top 10 center in history.
Basically it's Duncan and Kareem over everyone else because of the longevity of their success, yet Robinson-Hakeem-Shaq are close enough to argue in all other situations like skill in their prime or who-would-you-take-in-a-Finals-series-to-win. Ewing shouldn't even be in the conversation at all.
Regarding a best 3 year prime, let's look at VORP again.
1) Duncan - 2001-2004 - 21.6
2) Kareem - 74-77 -
27.2 (and in 1973 he posted a 9.4, so his prime was 4 years).
3) Robinson - 93-96 -
27.2
4) Hakeem - 92-95 - 21.3
5) Shaq - 99-02 - 21.6
6) Divac - 95-97 - 12.9
7) Moses - 80-83 - 14.1
8) Sikma - 81-84 - 12.6
9) Lanier - 73-76 - 20.5
10) Parish - 80-83 - 11.4
11) Ewing - 88-91 - 14.7
Ewing surprisingly had a good prime, but he didn't do shit in his final years from 96-02. 8 decent seasons doesn't make him a top 10 center when guys had careers that were much longer. Out of the advanced stats that are available, Kareem and David Robinson had incredible 3 yr primes relative to their peers of their era. Bob Lanier also had a crazy prime.
Ewing also wasn't the most efficient player, coming in at #44 all time PER behind players like Yao Ming, Dwight Howard, and Alonzo Mourning.
http://www.basketball-reference.com/leaders/per_career.html