Thread:Shabook/@comment-23892062-20161211004819/@comment-996391-20161211130028

Coulson did mention that he heard rumors about a man with a flaming skull from Robbie's part of the world. Maybe some of those rumors were about Blaze, not about Robbie. And besides, to and ordinary passerby all flaming skulls probably look the same.

Also, in the comics Johnny Blaze did end up in Hell so it's possible the AoS writers are borrowing something from that storyline.