User blog comment:Roy1313/Dimaria's Power/@comment-25111584-20160211163014/@comment-2214433-20160212203057

The difference between the two timelines is that Minerva and Rogue took on a mission to destroy Avatar, instead of Natsu and co. Erza and Gray somehow met up and decided to infiltrate. Chances are that while trying to act as an Avatar member, he ended up killing Frosch, either intentionally or by mistake.