Because he has to guard 3 point shooters, and he doesn't rotate that fast.
yeah...this "
Ayton can play PF" sure seems like
stuck-in-a-time-warp wishful thinking. The NBA isn't anywhere close to the same as it was when Aldridge was in his prime 10-12 years ago. And Aldridge in his prime was quicker than Ayton in a slower NBA; and Aldridge spent most of his time in San Antonio as a C
"
you are what you can defend" still is the NBA rule with very few exceptions. With that in mind and using BBREF:
OKC: Jalen Williams spent 83% of his time at PF; Kinrich Williams 60% of his time at PF
Den: Gordon 90% of his time at PF; 6'8 Peyton Watson 60%
LAC: Paul George 86% at PF; Kawhi 32% (
but having watched, I think the rate was higher at PF for Kawhi, especially after Batum left)
Dal: PJ Washington 97%; Derrick Jones 49%
Phx: Durant 85%
NOP: Zion 86%; Herbert Jones 45%
LAL: Lebron 86%; Hachimura 49%
Sac: Harrison Barnes 90%; Trey Lyles 82%
GSW: Draymond 80%; Kuminga 65%
Hou: Jabari Smith 68%; Jeff Green 69%; Cam Whitmore 49%
Utah: Collins 70%; Markkanen 49%
SA: Jeremy Sochan 84%; Cedi Osman 56%
Bos: Jayson Tatum 72%; Al Horford 51%; Sam Hauser 33%
NYN: Randle 91%; OG Anunoby 55%; Achiwa 62%
Mil: Giannis 59% (41% at C); Portis 83%
Orl: Banchero 93%; Issac 87%
Ind: Siakam 90%; Obi Toppin
Phi: Tobias Harris 63%; Batum 90%
Mia: Jimmy Butler 74%; Duncan Robinson 23%; Jovic 81%
Chi: Derozan 45%; Patrick Williams 93%; Torrey Craig 81%
Atl: Jalen Johnson 94%; De'Andre Hunter 67%
Brk: Cam Johnson 76%; Dorian Finney-Smith 45%
Cho: Brandon Miller 50%; Grant Williams 43%; PJ Washington 68%
Wash: Kuzma 81%; Avdija 42%
Det: Stewart 76%; Baogdanovich 59%
Minny: KAT 94%; Naz Reid 47%; Kyle Anderson 42%
Cle: Mobley 53% (47% at C); Niang 78%
a big majority of the guys Ayton would be facing are much quicker. More than that though is that most are very adept at dribble-drives and sticking three's. If the Blazers are foolishly trying a twin towers with Clingan/Ayton, it's almost certain the other teams will primarily do three things: one is force Ayton to spend a lot of time chasing players around the 3pt line (
where he'll be 20 feet from the rime during defensive rebounds); another is forcing Ayton to react and recover to dribble-drives around screens. And a 3rd thing is teams would force Ayton & Clingan to deal with PnR with ball handlers like Lebron, PG13, Durant; Tatum, Butler, and Siakam. Considering that both have spent their BB careers as drop-cover C's and that will be their instincts, those PnR plays should be good for some high comedy
of course the reality is that it doesn't matter. Portland will be a bad team next season and if they want to experiment with a tall, slow-footed C/PF combo that trip over each other and clog the paint on offense it might be entertaining and worth some chuckles