Michalis' entire character in SD revolved around being too naive and headstrong in his beliefs, and his "death" was supposed to be the moment he realized the error of his ways and bring his arc to a close. Kind of belittled when he survives. I can see why Marth becomes more naive in between games when all the good guys he thought died ended up doing the exact opposite. At least Basilio in FE13 had some form of foreshadowing to his faked death.