All you need to know about Amar'e and his importance to the Suns is this.
2004 - the year before Nash, they win 29 games
2005 - Nash's 1st year they win 62 and make the WCF
2006 - Amar'e plays just 3 games, Suns still win 54 games and make the WCF
They had varying degrees of success with him after that, but Nash was the engine of that team. He was by far the most important player. Marion and Johnson were also very important pieces with their shooting and defense that allowed Amar'e the ability to play inside and not defend all that well.
Griffin is actually pretty similar both in per game averages and totals. Basically across the board. Neither one is a HOFer, but at least Blake provided some excitement at the all star game dunk contest. Blake also adapted his game and learned how to shoot from 3. He became a fairly effectively stretch big. And while Blake doesn't have the 1st Team All NBA that Amar'e has, Blake finished 3rd in MVP voting one year (yet was just 2nd team all nba because KD and Lebron were 1st and 2nd in MVP and both on the 1st Team as the forwards), while Amar'e never got higher than 6th in MVP voting, but qualified as 1st team one year as a center.
If I told you that only one of those players averaged at least 20/10 (and did so twice), how many would think that player was Blake and not Amar'e?
As I said, I don't think either Blake or Amar'e should make the HOF, but if I had to pick one, it would be Blake. I think he was a more critical component of the Clippers success, was a better rebounder, and was more willing to adapt his game as he aged and lost athleticism. To me that is more important.
as for Kevin Johnson, he had a higher peak than either Blake or Amar'e, but he just didn't play very long. He basically only had 5 great seasons and basically only 2 other years he played a full season and he was not great in those years (one was his rookie year, the other at the tail end after years of injury riddled seasons). Even without the off court issues, I wouldn't put KJ in the HOF. He wasn't good enough for long enough.
Doc doesn't belong either. He has far too many seasons in which his team collapsed in epic fashion. He also just isn't truthful or honest in basically anything he says. I don't like the guy at all, which wouldn't keep him out of the HOF in my view, but I'm not going to his side if there is any gray area. Honestly though I don't think there is gray area. I just don't think he was a good enough coach and has way too many choke jobs.