If one of the most outspoken (and criticized) supports of the previous staff who would have every reason/excuse to not have anything to do with the new staff not only embraces the new staff but is vocal about it, I think claiming guys "weren't buying in" is blown well out of proportion. There may have been a couple but not nearly as much of an issue as some try to claim.
Now, "struggling to adjust" or "learning new concepts" I'll absolutely buy. Especially on defense, the concepts are so different that there can't help but be an adjustment period. And I actually this this is more what Gerry was referring to when he talked of "buying in" - not that they were fighting it, just that it was hard to get your body/brain to do something distinctly different.