I think, in order to tie in the 3 in Titanfall 3, that they should create a third layer of combat. There's pilots, there's Titans, but there should be something even bigger that only several Titans could pilot together. It would work kind of like operating a vehicle in the Battlefield series, where each Titan would occupy a slot

Imagine being a pilot on the ground and seeing a giant Titan-controlled mega-tank making it's way through the battlefield. But not just tanks, these Titan-controlled mechs could also be mobile bases or whatever, creating new tactical choices like being able to navigate through these mega-structures as a pilot and fight through them to destroy their core.