I see KD as a more realistic oportunity and way cheaper also. In a Kawhi trade, the Spurs would need to give picks away, in a potential Fox-KD trade we would be the ones getting picks, or at least we wouldn't need to give away any.I'd rather deal Fox for Kawhi. Harper deserves to start, he's American so he's going to have more the attitude of James Harden than Manu.
Both have injury baggage, but Durant will be 38. A starting lineup of Wemby-Leonard-Vassell-Castle-Harper would be putting in work. You'd need to sign or trade for a backup guard though in that case. I think we could get Kawhi for free though.
Also, we would be keeping the Spurs motto of doing right by the player by sending him to his home town to a team with contender aspirations.
. Nephew is 35 with janky knees and he burned that bridge when he fucked us over in 2018 regardless, and KD is almost 38 and has too much baggage (although admittedly he'd be a great fit and a significant upgrade over Champ at the 4 tbh).