Yeah, but for that he needs someone in power at the preps who hate the other frats (since he can't destroy the preps from within, Tybalt is the only true bad guy among them). Tybalt needs to be president and considering his downfall in S3, he needs to blackmail someone to get back into power again.
The other preps will probably have no problems working together with the DIKs, even if you didn't invite them before. I'm sure Jill will be able to bring them over as long as Tybalt isn't in power.
Also if it was blackmail against him, I don't think he would be grinning.
View attachment 4663653
At least those are my two cents