Word from some people I know who are friends with him said he didn't have a great relationship with Richt. They said Richt was hard on him and blamed him for a lot of the offense's problems. One friend even told me Kaaya had allegedly stated, "I'd rather get drafted in the 7th round or sign as a free agent then play under Richt again". To top it off, Kaaya had given that friend his new cell phone number because he was getting a new phone for after the draft. This was like 3 or 4 days ago.
I believe this.
Gundy has his QB coming back to Oklahoma State.
Smart has Chubb AND Michel coming back to UGA
Leach has Falk going back to Washington State
Stoops has Mayfield coming back (for now)
If Kaaya was clicking with Richt, he'd trust him to further develop him.