I'm not alone on support, marketing and design, but the on the coding side of things it is all wetsuit. When this much money is involved he wouldn't be making good decisions to trust anyone else with that.
"Normal" gambling sites do, although I guess they know the legal entities they're doing business with.
Wetsuit could easily get other users to program to help him build the site and add new features (it would probably be better to include more people to give ideas and code prototypes for wetsuit that he can then test).
Also, there is, as far as I remember from the site, only 5% of funds in a hot wallet, everything else is in cold storage...