My point is that you can't really blame Armstrong for it. For one, he got here 9 months before Bunting left. He did state he was evaluating for his first year. I would think he had to defer to Tocchet and other staff for how ready Bunting would be until he'd been around long enough to find out for himself or through other reports, but realistically, Bunting's readiness was unlikely to be a high priority so I can understand not being on top of it.
Furthermore, I believe Varady was up with the Coyotes all of that last season with Tocchet and he's now back in Tucson, so he who would have been a great advocate for moving him up from the Roadrunners and knowing he was ready, would have known his state from say a season prior where he may not have been ready, but were he to have been down there, I am sure he would have been up sooner. You have to remember we had a new head coach for the season and knowing what we know now about Sullivan and how he poisoned the draft pick of Miller, it does not bestow confidence that his evaluation and semi-final say for players to move up from Tucson to Phoenix was good enough to get Bunting up when he should have been.
Lastly, it's been reported that the Coyotes did offer Bunting more and he still chose Toronto. Toronto got him essentially gift wrapped as he hails from there, was inexpensive, and every one knew he had a very good chance of continuing in some semblance his break out that he had here in the last 20 games. He's obviously done so, but perhaps the length of a full NHL season has affected him of late, though to be fair, this is the first real season with a real grind in a few years, so understandable for a player to run out of steam if they've never experienced this before.