As a general rule, players get 4 years of playing eligibility. This can be increased by the following years that "don't count"

1. using a redshirt year (no more than 4 games + bowl game)
2. getting a medical redshirt (season-ending injury, no more than 40% of games, no games in second half of the season)
3. playing in the 2020 COVID year
4. Getting a year of eligibility returned if they had to sit out a transfer year under old rules

The latter two are obviously becoming less and less of a thing as we get further from those eras.

So here's what I see in Marion's career

• 2021: Played 12 games for UConn, Freshman Year, 1/4 eligible years used
• 2022: Played 5 games (with bowl) for UConn, so it's a redshirt year.  Did have a major injury, but returned at season's end so can't be a Med RS. Still at 1/4 years of eligibility used
• 2023: Played 12 games for BYU, RS Sophomore Year, 2/4 years of eligibility used
• 2024: Played 12 games for BYU, RS Junior Year, 3/4 years of eligibility used

That means 2025 would (barring a medical redshirt) be his RS Senior Year and last year of eligibility.  1 year remaining.

And yet I keep hearing he has 2 left?  Not making sense to me... but then apparently Utah is trying to get Dorian Singer another year somehow, so maybe the NCAA is just hadning out extra years for other reasons than the 4 listed above?