I've asked no less than 5 times, if attrition like this is the norm please provide some examples of other coaching changes resulting in losing 7 players....
Heck we can just look at SEC moves to start:
Pearl at auburn: someone feel free to correct me, but to the best of my knowledge hasn't lost any players from his current team. Landed a 4* recruit who's the #1 ranked JUCO, and kept the current class together.
Kim Anderson at Missouri: now keep in mind this is a coach from D2 who many on here laughed at the hire. He lost Kevin Punter and Namon Wright off his class, but kept their best player Jakeenan Gant. He hasn't lost any players off their current roster to the best of my knowledge.
Like you're saying, this isn't the norm for a coaching change, anyone who says it is, is damn blind.