I hope there's a method to his madness in this move. It's uncharacteristic of Ainge to overpay. Witness those great contracts of Bradley, Crowder and IT. Then he goes a signs a bench scrub for more--just because he's 7 feet? Was he thinking about the clubhouse reaction to this guy making more money than most of his much better starters?
There are two rational answers: 1) that's the new market price for a 7 footer (bad answer) , and 2) he boosted the salary for trade matching (maybe another bad answer, because who wants Zeller?)
The other possible answer, as I've said, is Stevens and Zeller have mutual ties in Indiana--and it's about favoritism. Though Stevens didn't play him much last year.
To me, Celtics improvement is about the Zeller Index. If he's still around, they haven't improved enough up front to be a serious contender. He and Olynyk are useless up front defensively. Two soft 7 footers who can't jump. At least Olynyk can shoot the 3.