Despite this guy's looks and mannerisms, I'm pretty sure this water boy is dealing from a full deck of cards unlike his fictional motion picture predecessor. That's why it's awesome that Kyle Lowry and Co. have included him in a team wide gag. This dude is absolute in on the joke, and fact that he makes it look like he isn't makes it that much funnier. The only alternative would be that the Toronto Raptors are getting a laugh at the expense of someone who is mentally handicapped, and I am willing to give them the benefit of the doubt that that's not the case.
It's got to be tough being a tertiary part of a sports team. Sure, you get to spend your days around professional athletes, but it's very easy to get treated like you don't exist. Considering this dude doesn't have a starring role in the script or an insane amount of retard strength like Bobby Boucher, his cameos in short viral videos are the most camera time he is going to get. It's not like the players are drunkenly punching him in the face (shoutout to Blake Griffin), they are just ripping Dasani's out his hand and creating a non-existent controversy in the process. It's better to be a part of the joke - even if it's the butt - then to be on the outside of every joke taking place inside the organization. The fact that the Toronto Raptors decided to include the water boy in this stunt just goes to show that they acknowledge him as a person, and I would be willing to bet that's not the case in every NBA locker room.
P.S. The hair, the fully buttoned shirt, and the gloves are such solid dedication to the role...I think/hope.