What sacrifice are you referring to? Where she stole Milchik's radio so Mark could make a break to save Gemma?

"Forgot that they spent the first 6 episodes looking for Gemma." - No seems like both iMark and oMark agreed on saving Gemma the only difference is that iMark isn't ready to die yet.

"How long would innie mark think he would exist inside." - I mean if iMark and the rest of MDR organizes the severed floor to fight back against Lumon maybe they find a way to escape the severed floor.

Also.. IDK maybe they flip the script and Gemma now has to figure a way to save Mark?