No, it's not. The numerator for Most Dominant Wrestler does not consider points from tournaments in the way you're thinking. It's simply 6 points for a Fall, MFF, INJDEF, DQ win, 5 points for a Tech Fall, 4 points for a Major and 3 for a Decision, regardless of whether the bout was in a dual or a tournament. Similarly, a loss of any kind and the same points are deducted from the total (6 for losing by Fall or MFF, INJDEF, DQ), 5 for losing by TF, etc. Zain's 5.19 means he AVERAGED better than a Tech Fall this season. Equally amazing, we had the 2nd place finisher (Bo at 4.81), the 5th place finisher (Mark at 4.52), and the 6th place finisher (Jason at 4.37). Jason's finish is astonishing, in that the INJDEF from the Rutgers Dual, meant a SUBTRACTION of 6 points from his total before dividing by the number of matches. Assuming at least a Major in that bout, and it's worth an extra .37 points to his Most Dominant Wrestler calculation.
For Zain; Eighteen 6-point wins, plus five 5-point wins, plus four 4-point wins, plus four 3-point wins equals 161 points. 161 divided by 31 bouts equals 5.19.