Outside of the mediocre AHL stats, I suppose you're right.
The debate is largely personal preference. I like the way Detroit has historically brought players up. It's the way we brought players up in the 00's as well (coincidentally our most succesful time as a franchise).
I commented originally based simply on my memory of his rookie season and whether he was ready...versus rushed
In 2013, we had 11 forwards with 250 minutes of even strength ice time
Zibanejad was
T2 for even strength points
5th in CF%
2nd in SF%
1st in Gf %
2nd in xGF %
2nd in SCF%
5th in HDCF%
He was sheltered and led the team by a wide margin in offensive zone starts, but that's not uncommon for a rookie centre
His faceoff win percentage wasn't good, but neither are his career numbers
That was also the year Spezza went down early and Zibanejad's play was one of the reasons we made the playoffs
As I said earlier there's really no metric you can hang onto that says he was rushed.
I am even inclined to think that his early success coupled with his maturity might have led him to think "hey this is easy"
I think he was moved because he wasn't living and training like a pro. And that's been an unfortunate trade