They might have been scared that he might go somewhere else.
It also allows them to get out of Poole's salary for 3 years. They might seriously be looking at life beyond the Curry era. Their recent picks have mostly been duds, Draymond has opted out, and there is a chance he might not be back (trading away Poole might help him return
). Klay played well, but he too will see his production go down over the years.
Poole is being paid almost Fox level money. Will make a restart easier.