It would have been Peeth Peeche vaar if Bajaj had not revealed himself or if he was ditching Basus by being their best friend. Bajaj has declared his intentions of ruining Basus clearly. Komo is just one raw nerve of Basus he will press to have his revenge.
That's not Peeth peeche vaar. That's exploiting your enemy's weakness. Komo was pain the Basus ass. Bajaj knows it & he will use that as a man hell bent on taking his revenge. Him not revealing his true intentions is a different story altogether & has nothing to do with Komo. Komo is just a small part in his grand plans of revenge. He didn't need Komo for his revenge but Komo went to him for her own vendetta.
Bajaj just wants revenge & he would do anything to have it, even use Komo. Him being evil will depend on his back story. He isn't evil as of yet, he is a curious mystery right now.