Ever wonder if Lore replaced Data at the end of 'Descent, Part II'?
https://startrek.website/post/37701302

Ever wonder if Lore replaced Data at the end of 'Descent, Part II'? - Star Trek Website
Not my OC
Data and Lore switch places on every encounter. From Datalore to Brothers its Lore. Then it’s Data again until Descent. Then back to Lore until Nemesis. That’s the real reason Data’s personality is all fragmented when he returns on Picard. Too many swaps got him confused.