Sliding doors moment for who? You think Orlando would be better off with Holmgren as their primary option instead of Banchero? Or you mean OKC would have preferred to have Paolo as a duo with SGA over Chet?
For both OKC & Orlando
Think of the fit if you swap both guys.
Suggs
Bane
Wagner
Holmgren
Carter Jr
That team has much better balance and defensive versatility.
Now imagine putting Banchero on OKC. You could say he would have cost them the title last season, as he would ruin their identity. OKC lived off being an impossible defensive wall & having three point shooting. Banchero would be a hole in their defence (especially being unable to switch), and he cannot consistently shoot either.