I wish I could find where I read this, and I can't, so please forgive me if i have this remembered wrong.
I seem to recall reading that McVay follows the philosophy that everyone should feel like their job is in jeopardy.
That doing so pushes everyone to do their best out of fear/paranoia (my words)
And that you have to turn over your staff occasionally to show that you mean what you say and to keep fresh ideas coming in.
I *think* this comes from Bill Walsh's book.
So, I don't know if clearing out 8 staffers was following this mantra, or job performance, or some of both.