Hey Cal, I also asked this in the Sonic discussion thread but feel like you might be able to give me a more direct answer on this. Would the Sol Emeralds' feat of merging Sonic's and Blaze's worlds still be considered 2-C if their feat of merging those 2 universes was not done passively? So the scenario would be the same and it would still be an overtime feat but this time someone like Eggman has to grab them and force them to merge those 2 universes (they can still use the energy of the Chaos Emeralds as well to accomplish it, it's more about the overtime thing).
Honestly I fully believe that feat in general was a chain reaction and shouldn't be a notable feat. It was purely due to the CEs and the SEs being in the same universe causing stuff going down. Not because the SEs were pulling two universes together.
The main reason I'm asking is for the Chrono Navigator in Ben 10 to find out if it is an overtime chain reaction or not and if that matters for it's 2-B tiering or not: If you want to have a look then here are yourlinks.