IMO, it is Wolf/Tsar who are 'taking the spot' from the Peals (IOW, taking precedence in the selection process). W/T obviously were instructed to go back to compete juniors this season internationally, when they had competed seniors after first partnering. Katarina also has prior senior experience with her former partner, J.Chen.
It is certainly to W/T's and USfigsk's advantage for W/T to have competed this season in juniors internationally. With their talent coupled with their senior and junior experience, they have obviously been a 'sure thing' for junior medal podiums. Had they remained in seniors internationally this season, they would have had no chance for amassing medals. Now, they have been able to gain medals and confidence together as a fairly new team, not to mention padding their individual and collective resumes. W/T were rewarded at U.S. Nationals with a good placement, even edging Bratti/Somerville in the RD

, albeit B/S bested them in the FD and overall.
I am not saying that this 'return to juniors' strategy is wrong (with age eligibility changes having made it possible). It is just part of what ends up happening when there is an abundance of talent and few opportunities to gain competitive experience.
And then, there's the bright, unexpected brilliance of young Aboian/ Veselukhin, who at their ages and with their amazing combo of starmaking talent, will be lighting up junior podiums for several years to come (until Aboian reaches 17 and they move up to seniors). Fingers-crossed, of course. But they have blazing talent together which obviously deserves to be nurtured and rewarded. Their combined talent can't be predicted or manufactured, it just happens organically and unexpectedly.
The sport consistently lags in addressing problematic competitive development concerns.