I don't think you can read anything into AotP ending at the end of 2026 and Nexus' limbs and frame coming in 2027. These sublines for Generations aren't hard and fast rules.
Buzzsaw showed up in CW, and he was a preview for TR.
PotP was basically bonus content for both CW and TR.
Siege had Apeface and ER had Snapdragon, two characters who fit the TR play pattern to a t.
Kingdom started a Generations Beast Wars collection that continued through Legacy and AotP.
We're still getting TR Deluxes.
Animated Generations figures started in Legacy and have continued into AotP. Same with the UT. Technically UT started showing up in Siege.
I'm just saying that 2027 will likely be called something else, year one of a new subline. That was never a hinderance to using some slots to fill out previous lines though. They've been doing it for years.
I do think
@CoffeeHorse is onto something with the gap between Nexus and his team, but that doesn't necessarily mean they've scrambled over the last two days to pivot. From what they said it sounds like Nexus was a hard nut to crack for them. He was going to be a Leader, and then he got shuffled into Voyager. Then they considered making him a Duocon but couldn't make that work. It just sounds like he was kind of a problem to get right, and by the time they settled on "Voyager and we'll get his limbs out separately" it was already 2027 in the pipeline.