Sandblast has very good dm and I think is better than most people give him credit for. That being said though, he does have a bit of a toxic personality in game, but it's only out of his passion for it. As a teammate I'd say his biggest issue is how stubborn he is when it comes to evaluating the teams play and what went wrong in bad situations. Once he has an idea in his head of what happened is very difficult to convince him otherwise.
I think he could be an extremely strong player on a team with someone who is as passionate about the game as he is and that he trusts to make correct calls and he believes has a larger brain than his and is smarter.
After looking over the details of his gameplay and personality, he seems like someone who would be a perfect teammate for our favorite player b4nny. I'm sure he would wear the Froyo tag proudly in game, as well as turn on b4nny's stream on all the tvs at best buy to support his team in the real world. With his tiny brain, he would be the perfect little minion.