I’m confused too - the Cal that went with Dirk and Bro through their portals are the same one at the same point in Cal’s timeline - having just been created in Dave’s dream - so how did Bro’s cal end up being filled with LE’s components?

Because, again, it’s not filled with it. It’s manifested through. The only Lil Cal that is ACTUALLY full, is the one hovering in the middle of the Furthest Ring, messed up and Hearty Thing’d by Dirk. Think of Lil Cal as an antenna. It takes ‘signals’ from this main Lil Cal in the Furthest Ring, and manifests LE’s will through it. When the Scratch happened, that Lil Cal was fated to become the full Lil Cal- Meaning it stopped receiving the signal, as it would eventually become THE full Lil Cal itself. Also remember it wasn’t just ‘it just went through a different portal to a different time’, the Scratch is described as an extremely violent upheaval of the Timeline. The act of splitting the Timeline in two itself wasn’t just an intangible switch of a gear, it was like, the death of an entire Timeline. That sounds dramatic enough to alter the properties of a Juju.