1) That's Schaub's tattoo on the left shoulder. Not much arguing he's the guy on the bottom.
2) Overall shape. Height and body size says that's not Jones or Rogers. Both are significantly taller than Kimbo, and that fighter appears stocky and not 6'4 or 6'6.
3) Top fighter is wearing the exact same fight shorts kimbo wears. You can clearly see it in the Ep 3 preview. Kimbo wears the black tapout shorts with the white ring around the right thigh. Rogers has always been shown in red shorts.
4) Dark knee guard on the right knee, same as Kimbo wears in training and the Nelson fight. Rogers (and Jones for that matter) have never been shown wearing a knee brace (although possible they do of course).
So Kimbo either beats Nelson or loses and comes as a substitute to fight against Schaub in a later match.