Warmups in practice were voluntary under Dennis Allen (merged)

You would think so, but sometimes naturally we all would tend to take advantage when the boss says we can be excused from something work-related, especially physical type work, athletes too…hell, ESPECIALLY athletes.
It may depend on the college program they came out in regard to their attitude towards exercise. Ive known people who are gym rats and only eat certain foods they consider heathy. Other athletes do the bare minimum just to get by and rely on their God-given athleticism to get by. This discrepancy probably applies to “activation” too.

I wonder if there is enough evidence in studies to make any definitive conclusions.