If you're looking for a history, players who got 1st or 2nd cap in January camp by year:

'14: Yedlin
'15: Zardes
'16: Acosta
'17: Zimmerman
'18: Adams, Roldan
'19: McKenzie, Cannon, Long
'20: Ferreira, Aaronson
'21: Turner
'22: dud
'23: Paxten? Aiden? Vazquez?Zendejas? Tolkin?
'24: Ragen? Wiley?

To clear up confusion, the trial will be about US Soccer's application of the Pro League Standards to NASL, rather than about the legitimacy of the PLS itself. The judge granted summary judgment to US Soccer/MLS on NASL's Count 1 in June, which had alleged that the PLS was itself anti-competitive.