The first sweep is worth 6 pts - 2 for the sweep, 4 for mount. Since the guy in the background says "6-2", and since Scott starts on his back, I assume the match started with Scott getting taken down for 2. Assuming 6-2, It should go like this: 3 pts for scott's pass, makes it 9-2. 4 pts for Vince's mount, makes it 9-6. Fight over. My guess is that Vince got 8 because the ref gave him sweep pts on the armbar. This is clearly wrong by both the written rules and by what it taught at referee seminars by the IBJJF. Scott was in a dominant position (side control in this case) and not in any guard. Therefore, it is a reversal. I forget if that is an advantage, but it is NOT 2 pts.
Even if it were 2 pts, it should have been 9-8 Scott. He got screwed - sorry buddy. I guess this makes Scott an official 10th Planet fighter (now that IBJJF has screwed him out of a win).