"According to two members of the Packers organization, its common knowledge that Packers coaches and executives who move on to bigger and better opportunities are instructed to leave the Packers staff alone."
How exactly is this common knowledge? Philbin is the first assistant under McCarthy to get an NFL head coaching job.
It does go on to say that if an assistant is making a jump up in the ranks, the Packers will let him go. For example, if Philbin wants Ben McAadoo, the tight ends coach, as his offensive coordinator, they will let him leave.