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It is funny that holoJPs are actively approaching them, highlighting their cuteness and showing them to bigger audience. Not only that is decent human behavior, but also they know that if someone is great then they will get more audience that will spread to the other chuubas. Small fraction of their fans may be gone, but they will fanatically advertise their coworker among their friends, and in the long term the friendly JPs will be on plus.
Now compare those actions to senpais from HoloEN. Basically excluding them from collabs with anyone to secure their bleeding out scraps of the audience.
Only JPs are idols