Otis had a much heavier load to carry at Mason.
Looking at their head to head match up, they both shot equally as poorly against each other (1-5 for Otis; 1-8 for Chartouny), both wound up with around the same number of point (7 for Otis; 8 for Chartouny), the difference being Fordham has more shooters right now.
Overall, Otis has a better field goal percentage and better 3-point field goal percentage for the season while playing over 300 more minutes. Chartnouny's assist totals are really impressive, but if Grayer was shooting 41% from 3 and Thompson or Marko was shooting 65% from the field, Otis probably would have 2 to 3 more assists per game too.
Chartouny is on the better team right now and that probably pushed him over the top (more wins = more votes).