If they plan on keeping these two fleets separate, then won't they need to keep the blended rate separate? CAL 757 vs UAL 76T?

Right now I'm pretty sure the blended rate for 757/767 includes both CAL and UAL aircraft.

Once they start parking the UAL 757s, those in the 76T should benefit from a higher blended rate since it will have a higher percentage of 767s, but as it stands, those bases will be watered down if they still include all CALs 757s.

Once the UAL 757s start to disappear, the 76T bases will basically become almost 767 only bases won't they?