Thread:Trigger009/@comment-27530109-20170517133430/@comment-24922135-20170601123216

That's fairly obvious. Heatblast wasn't redesigned until UA. They probably did use Alan's model sheet as reference for Heatblast in AF, assuming that the thinner frame came with the artstyle. After all, Alan is thinner than even OS Heatblast, so it would be fair to assume that Pyronites were supposed to be thinner in AF until the character designers gave them a proper reference sheet.