I believe that once they allow Juniors, they can only upkeep the ban on Seniors for maybe a season or two longer. But even if that's not sure before this season, you kind of have to plan as if it's going to happen, or you'll be the one woefully underprepared if it does happen (though I guess that would be very in line with the Russian fed's philosophy

).
And honestly, I would find it kind of unfair if two JGP spots (+JGPF and possibly Jr Worlds) went to only one of the three top contenders when their results from last season don't justify it.
Lena won Jr Nationals but was beaten by Lidia earlier in the season, and is the skater that most exemplifies what international audiences think of Russian skaters (technically very skilled, but bad programs and bad political attachments). Sofia finished off the podium at Jr Nats but beat Lidia at the JRGP final and is an ethereal skater who would likely appeal to international judges and audiences (not unlike baby Sofia Muravieva did in 2021). Lidia placed second at both Jr Nationals and the JRGP final and is a well-rounded skater, plus her coaches have other skaters on the JGP circuit currently (Stefania Gladki and Sofia Shifrin). Their top scores also aren't that far apart, especially without knowing how international judging will impact them (228, 223 and 218).