CP3 despite conventional wisdom has been very good when the team has needed him to step up in the playoffs. Despite losing in 6 games to the Bucks, he averaged 22/3/8 on 55/52/75 in the finals despite playing through an injury.
Devin Booker who was the first option averaged 28/3/4 on 54% TS.
CP3 is way better than Nash on defense (7x All Defense 1st, 2x 2nd) and way better shooter/scorer than Kidd (regularly known as Ason Kidd til very late in his career when he finally got a 3pt shot). It’s only IT, Magic, and Big O on skill/well-roundedness (and size for the latter 2, but that’s not something Paul could have changed) and Stockton on longevity and no injuries that I have over CP3.