I like your top 9 (though I would have AD at 5 or 6), I think after that top 9 (the cream of the NBA imo) 10-17 are totally interchangeable to a certain extent (I think Irving belongs somewhere in that 10-17 range), then 18-23 is another tier of interchangeable guys, then the rest .
Good list overall. Well done
My thouts to. First five or so ranked 1.a but listed in order next group 1.b in order next group 2.a interchangeable than so on an so forth.