If I were to take a completely uninformed wild guess, I would speculate that Color Rush uniforms are not automatically assigned to Thursday games in Franchise on account of potential color conflicts beyond year one. Having the game default to a white vs white match-up (say, the Cowboys against the Bengals in a color rush game) would be awful UX, especially if that weren't properly and immediately communicated in the front-end prior to a user vs CPU game (as far as I know, we still can't directly change the CPU jerseys in Franchise).
On the other hand, if every team is getting a while and color Color Rush jersey, then all bets are off. I haven't yet seen a colored variant for a couple teams, however (ex. Dallas only has white).
Very happy to get the color rush unis in the game in any capacity, however.

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