That...Would end up with a hilariously silly miscalculation on the Ascian's part I don't see happening. After the 13th fell to the Flood of Darkness, I imagine they were very careful to not make mistakes, and leaving behind parts of the aether that was supposed to go to the source is a pretty big problem on their end.

Could be wrong. Just seems unlikely. To me it all sounds closer to a shard being prepped for Calamity 9, but with no Ascians babysitting it, it went a little out of hand until the shard basically ended up with Electric Eulmore.