Could GSP self promote his comeback?

Underground
1

Or is he under some sort of contract that says if he returns to MMA it will b with the ufc? I would buy a ppv purely with a GSP fight alone Phone Post 3.0

2

The way things are going he might have to. Phone Post 3.0

3

ZombiedKoreanTurnipHead - The way things are going he might have to. Phone Post 3.0
But the question is can he legally do it? Phone Post 3.0