I don't see why all three of them can't commentate.
Besides, do you think a TO has ever told Brandon that so-and-so had to commentate on his videos? No. Waffles owns all the equipment, and he's in charge of all the video processing and uploading, so he gets the final say on everything. The only thing is that the laptop isn't mine; it's Duffy's. If anyone can tell me who should and shouldn't commentate on these videos, it should be him.
Also, as I said before, Tony and Sean won't be camping out at the laptop the ENTIRE duration of the tournament. It's probably going to be an open-mic thing, except giving people priority. Look at Brandon and Phil's videos. There's two or three main commentators, and other people chime in occasionally, and if the two are busy, other people take over.
First priority goes to Sean, Tony, and Oscar (in no order), and everyone else goes after.