If you look at it that way T, then his time at Bevill wouldn't have even counted against his eligibility at all. A players clock doesn't start ticking until he is actually a member of the team. For example, I was at Bradley for 5 years but I never played any sport, so if by some miracle I suddenly gained athletic ability, I would still have my full eligibilty intact to go back to school and play for BU or any other school.
If the NCAA rules that his injury at Bevill State doesn't count as him being part of their team as you say, then it would mean he never used that year of eligibility. If they rule that he was part of the team at Bevill State, then the injury would qualify him for the sixth year waiver.
I think the clock starts as soon as you begin college as a full time student. If you take less than 12 hours then it does not start but then you are not considered a full time student and thus ineligible to play a college sport.
I also think that once a student is enrolled full time the 5 year eligibility window starts. I am only a practice player but we also have to clear the NCAA requirements and given that this is my 5th year in school, I was told this semester would be the last semester that I would be eligible.