4 Best Theories On How Coulson Is Still Alive
#3 The Life Model Decoy
What if the Coulson who died, or the Coulson that lives, is really a robot?
Life Model Decoys is a popular plot device in the comics used by characters including Tony Stark and Nick Fury. InThe Avengers Tony Stark as a joke mentions a "Life Model Decoy" to Coulson when he comes to Stark Tower. Stark mentioning a Life Model Decoy to Coulson may confirm that both him and Coulson must know about Life Model Decoys, or that they may at least exist.
There is a possible flaw with this theory and that is when Loki killed Coulson, the blood, and everyones genuine concern for him seem to indicate that he really died. Although, if no one knew he was a Life Model Decoy it would have made sense to put fake blood in it.