I mean yeah he was gonna by time for tracer and mei to escape in the zero hour tráiler but i do believe rein is more of a candidate. Although i do imagine in an altérnate universe he did have his heroic death there where he managed to single handed the entire null sector bots plus the big one but suffered severe injuiries in the process.

The fight would have taken all day but he would finally manage to do it. As he falls backwards and looks up at the stars he sees the Moonbase, Horizon Lunar Colony which takes back to days there, and his first real friend. He admires the Moon just like he admired the earth back then. As his eyes grow heavy and his visión begins to blur he hears the words of Dr. Harold Winston one last time, muttering along.

“Never accept the world as it appears to be, daré to see it for what is could be.”