User blog comment:Roranoa zoro/Eternal Flame,FT's foundin' members,Acnologia's DSE/@comment-4829046-20130714140108

The other guy is speculated to be Makarov's dad.

Acnologia's element was disputed countless times so we all have different ideas. When he was in human-form means that he had only one element and since we have no clue as to how the element system works its really difficult to give an answer.