2.) Rudy Gobert
If the Spurs decide that Zach Collins isn't the right fit next to Wembanyama, then they could look to upgrade the position via trade, and Gobert might be an option. Currently, Gobert has three years and $130 million remaining on his contract, which is admittedly a lot, but he does bring several things to the table.
The most obvious one is his defense. While he isn't quite the same elite rim protector he once was, he is still among the league's best in that area. He is also a terrific rebounder. Pairing him with Wembanyama would form a terrifying frontline with two seven-footers with massive length. Imagine Gobert putting a lid on the rim, freeing Wemby to defend on the perimeter, and providing help defense with him seemingly being able to be everywhere at once.
The defensive potential of a Wembanyama and Gobert frontcourt would be great, but there would be offensive concerns with Gobert being a mediocre offensive player at best and with virtually no range outside of the paint. However, considering how well Wemby has been playing out on the perimeter, that may be less of a concern.
But who would the Spurs trade to acquire Gobert? Devonte Graham, Doug McDermott, Cedi Osman, and Sandro Mamukelashvili, a first-round pick, and two seconds for Gobert could be enough to get a deal done, should the Spurs go this route.