Jimmy originally suggested ~8B+, but Shawn and Nalle thought an upgrade to ~8C was warranted. Not that surprising as the style of the problem, compression on "barely there slopers", is Jimmy's #1 strength.
Both Nalle and Shawn are also considerably shorter than Jimmy, and height, or lack thereof, could definitely be a factor as well.
Arjan De Kock, who was there with them and also took the photo, commented:
Well dang that was inspiring Shawn Raboutou and Nalle Hukkataival double takedown!!! Pity I wasn't in fighting shape for a triple takedown of Khoi Khoi, the notorious Jimmy Webb, 8C/V15!! Jip the boys gave it a upgrade!