Strenuus point is valid on all accounts: I like Joel, he did work his ass off and is a nice option. But liking the guy and him riding pine in favor of a stronger center brings to light the truth of the league: Who said things have to be fair?
That said, I think Portland does better than most on this facet of the game and looks to treat players fair...You get a Hawes or Gortat or Gasol or Okafor and you get them to BELIEVE in the rotation and the system. Can Scotts do that? not sure. Pop can for sure...he'll I'll bet ANY of those 4 would fight for the chance to play for Pop 2nd fiddle...like fight in a 8-sided cage for it. This concept though of 'buying' into your role is what I think Portland gets the most gain in the offseason from the bench with. You tell Will, T-rob, CJ etc..."Look, you'll get the minutes...I need you to play your role out there 100%, not try to fill 3 roles @ only 60% effectiveness." This then translates into HOW you get a valued big for backup center. 2 legit starting centers willing to work together for the purpose of wining games. Bring in an elite big man coach...that's what's needed.
Factor as well, Robin (love the man, perfect fit for Portland hands down) isn't 100% the player he was. Post-injury he's lost a lot off of what he had. He's STILL a good center though. But if you can have 2 GOOD centers splitting the time 24 mins each...you can keep BOTH of them healthy! Right now, like many teams...we wear down our starting centers with 'starting' minutes and are screwed if one goes down. Joel showed he can come and and play. Add 2 years to his game at the progress level he had been showing and BOOM we are right there...But if you've got that in the wings, and can have a 3-center rotation (makes more sense with Hawes who can spread out defense since you have to somewhat honor his shot) you get MANY more offensive and defense sets than we currently have. Want to run a twin-towers? DONE, defense lock down with Robin + Gortat for 5-6 mins. Want to pick up the offensive pace with 2nd unit but still be able to rebound? DONE, Will, T-rob, Mo, CJ and Hawes activate! Just saying, gives you MORE than just a Robin <> Joel swap in rotation does.