The Spurs desperately require some proven talent on the front court. Golden State could use Marco's shooting to help fill the void left from Klay's injury. I don't recall reading anything mentioning Boogie being a bad team mate or problematic in New Orleans /Golden State, perhaps he's grown up a bit and in addition to that this off season has humbled him? Just several seasons ago he was a 25/13 player, yes I know he suffered a major injury, but what do the Spurs have to lose by rolling the dice on someone as talented as Boogie? Despite the injury he was still better than anyone outside of LMA/DDR last season. Boogie can shoot and actually make threes in addition to being a menace in the paint.
If he doesn't pan out the Spurs wouldn't have really lost anything. The market is nonexistent, if the Spurs can obtain him for a price tag similar to what GS paid last season why not? Boogie at the 5, LMA at the 4, Rudy at the 3, DDR at the 2 and Derrick White or DJM at the one and that is an infinitely better lineup than what the Spurs rocked last season and there would be a solid bench too.