Isn't part of the reason he left Green Bay the uncertainty of how long Rodgers was going to keep on playing there?
That was probably 25% the case, 25% of it was the front office waffling around paying him fair value for like a full year and then 50% playing with Carr.
I don't think Adams cares about long term at this point.
My best guess would be that there must be some connection between eastern Kentucky staff and the Packers staff/area scouts who tipped them off about Boyle being a great QB room guy. The brought him in for a pre draft visit in 2018 and in the 2018 preseason he wasn't bad at all.