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The reason the dittos shared pain in the original series is because the sensor nodes that help the hive mind where way to sensitive at the time and later they where just recalibrated
What do you think Dittos copy limit is?
i think ditto specifically has more of a limit then an actual splixson because the omnitrix would time out at some point because of power drain, but like I don't have an exact number
Headcanon, if a splixson clone is like knocked unconscious (e.g argits quills) the rest get only slightly disoriented but if the main splixson gets knocked unconscious then the rest of the clones all end up like half asleep. This is just a fun idea with many things to do with it
I found some extra trivia on the fandom wiki and that has informed me that during devide we stand Animo took the main ditto so that brings me to the headcanon that all the splixsons only all die when the core is killed not when the clones are.