Leaving this here for further analysis:
In the summer~ I was in a call with Dave and Stui, and also Dave alone, and Dave said:
1. He's not paying Stui back because it's PayPal's money so he gets to keep it
2. Stui has gambling problems so he'd gamble it away anyway
Stui was originally owed $530.
According to the evidence posted on the dispute:
Stui is saying he's paid back $155.39, so it would be $374.61 leftover
Dave is saying (correct me if I'm wrong) he's paid back $265, so $265 would be left over
Anywhere Stui says he wants less than the original amount should be ignored, because Stui felt like he was going to get none of it if he didn't bargain for it, which he shouldn't have had to do in the first place. Dave, just pay him back whatever's left over and stop being an asshole, or prove you've paid back $530.