Over 20 for all of them, maybe 25 at the cheapest.
Jrue might be the best hope.
He turns 27 in June, the perfect age to be with Kawhi. Great size and length, no nightmares over needing to hide him somewhere like Parker and Mills.
And family and off court issues are what seem to be most important to him. Spurs still have Monty Williams, and they were said to be close, so the whole 'Spurs Culture' might be the difference here.
I don't even worry too much about his injury history, I chalk a lot up to the medical team in New Orleans not being up to par and shared with the Saints. Look at Gordon and Ryan Anderson, as soon as they leave, they're healthy all year.