rival. You can't say it's because of NIL, because you just conceded you can't compete with your rival in a HUGE area of significance for all future recruits. You can't say it's because you didn't want them, because they were key players on your team last year. And you can't tell the truth about how they are jumping ship because of major internal problems with your team.
All you can really do is say "they made a personal decision and I wish him them the best." But no, KW simply doesn't know how to take the high road.