I guess you're right, there really was no use for him then, hence why he appeared on PD101. I mean JYP isn't going to debut another boy group for a long time and if he debuted, it'd be in few years.
Honestly, I don't know even what's the truth or not. With Seungri getting away all his bullshit that's multiple times worse, I can't trust anyone. So even if there are people defending Seobin, it makes me doubt whether it's truth or not, because that evidence will soon mean nothing and that sucks for everyone, not just him, but other idols as well in case they're in the same situation. :/