... (and as Futurama's Central Bureaucracy notes, "technically correct is the best kind of correct"), the Changeling - in the guise of Charles Xavier - was the first member of the X-Men to be killed in action. Which a lot of people seem to have forgotten. But even if John Proudstar was the second X-Man to be killed in action, one would think he would be revived on Krakoa. Even if some of the other X-Men (I'm looking at you, Logan!) would be jerkish enough to then keep reminding him how stupid he was in his death.
Note: I say technically because at the time of his death only Professor X and Jean Grey, the organizers of the switch, knew that the Changeling had taken Xavier's place on the team, while the others were kept in the dark until the return of Professor X several issues later. (The real story was, of course, that this story was a retcon to undo Charles Xavier's first death).
...but no team forgets their second casualty either so...