Sean doesn't use wrestling for the same reason Justin Gaethje doesn't use wrestling...it taxes your cardio.
Sean has good cardio, but he chooses to use it to fuel his tools.
Anything outside of that puts serious stress on his cardio.
Its like trying to make marathon runner do sprints...yes the marathon runner has cardio for days but he won't if sprinting.
Like
@HHJ said, he stays in the same gear the whole fight.
Now, that's how he wears people down in my eyes, but occasionally redlining puts him at a deficit.
I personally thought he won that fight last week, but he could use a trick or two up his sleeve to keep his opponents off guard, but I don't think TDs are that trick.
He has good boxing, good defense, and personally I think calf kicks would be a real option for him since everyone is worried about the jab.
Just my opinion of course.