We really need to find a PF with great size & length.
You can get by with wings the size of Murray and Barnes if you have a big, long defensive C but when your C is 6’10” in shoes with a 6’10.5” wingspan, it can really be exploited in certain matchups whether that’s on the glass, on switches, having a guy like Jaren Jackson just rise over you, etc.
From a size/length standpoint, I think Murray at SF is solid (6’8” in shoes and 225 lbs with a 6’11 wingspan) and but Barnes (6’8” in shoes and 228 lbs with a 6’11.25” wingspan & 8’6” standing reach) is fairly under sized for a PF. Having a guy like Anunoby (6’7.75” in shoes and 233 lbs with a 7’2.25” wingspan & 8’11.5” standing reach) or Siakam (6’9.5” in shoes and 227 lbs with a 7’3.25” wingspan & 8’11.5” standing reach) at PF would really help.
On top of his size & length, Anunoby’s 3PA/36 min, 3P%, 3PAr, defense, and age would make him an excellent fit with our current core.
However, as much as I like Siakam’s game and think he would be a great fit next to Sabonis, I don’t like the offensive fit of Fox-Siakam-Sabonis. All these guys like to make their living in the paint/midrange. If we were to bring Siakam here, I’d have to look at trading Fox. Siakam and Sabonis would be one of the most dynamic front courts in the league and their passing would be reminiscent of the Webber/Vlade days I’m sure, but they’d need 3 shooters around them to maximize their impact.
Theoretically speaking, VanVleet would be a solid fit at PG in this hypothetical. I’m not convinced we could trade for Siakam and VanVleet without giving up Murray but if you could be left with a starting lineup of…
VanVleet
Huerter
Murray or Barnes or Anunoby
Siakam
Sabonis
…you’d have to at least consider it.