It should not be a surprise that the MLBPA is advocating on behalf of Kris Bryant despite negotiating things like signing bonus caps for draftees -- Bryant is going to be a member of the bargaining unit in about two weeks, and would be even sooner than that were the Cubs not to reassign him so as to gain control over his seventh big-league season. That control affects how much money he can get in free agency, and thus how much leverage he has if he wants to sign a pre-free agency extension, and generally the entire course of his big-league career, all of which is well within the union's typical area of concern.

By contrast, {Insert Your Favorite Draft Pick Here} may or may not be a big-leaguer ever.

This of course raises the usual issues of the shitty lives that minor-leaguers have and their lack of an effective advocate, and how the MLBPA is in the best position of anyone to try to organize them, but that's a further conversation, and one on which I've been heard, though that piece, one of the first things I was paid for, is lost to the sands of time, sadly.