Like the raptors with kawhi? Netted them a championship.
They'd been flirting with deep runs for years, Houston is having their first good season in years. A young, promising team like they have, giving up a lot of assets for a rental would be crazy to me. And Kawhi was a proven superstar with finals MVPs, defensive MVPs, a ring... while Fox is a dude who scores a good amount and made the playoffs once.
If they think they can resign him, then that is another story, but if he is dead set on San Antonio then it would be really foolish.
I also just don't think for is that kind of star. He is a good player, but not at all someone I'd make a huge gamble on.
What they need to do is upgrade from Jalen Green. He is flashy but an absolute sea anchor for them. He is what Oubre was for the emerging Suns... this fun guy who makes some highlight plays but somehow the score always seems to move in better directions when he isn't in the game.