When any team is completely shifting away from one regime to another, players are often stuck between a rock and a hard place. If they are wary of the decisions being made, expressing that in any way will be viewed as them being a distraction. If they choose to hype up the changes, it can make them look like they had it out for the previous regime. The Miami Dolphins' players find themselves in that exact situation at the moment.
There are ways to properly navigate it, of course, but sometimes saying nothing is just fine.