You saw how good the show was, that was a great move for bringing bobby back.
Freeze got a lot of backlash from doing the show so he backed off, i am pretty sure this is what happened especially all those threats he was making talking about how he will beat up other comedians n shyt, it started to affect his paper and relationships. Freeze would also be very nervous when other broads (rita g etc) would come on, he wouldn't make any eye contact, dude has serious issues man.
Bobby provides the balance between comedy and serious stuff, zo is not into the show except the guest is free to express themselves, this is why Zo and Bobby work well together.