In usual Hiro Mashima fashion, he hyped up 3 cool characters just to make them quick fodder in the end...
Seriously How can we even look forward to these elemental 4 when he just did that to characters we looked forward to seeing fight even more?
Plus ironically they got beaten way easier than the Hacker dude they killed for losing in chapter 43. He was way more useful than them.
Hopefully Hiro stops going back to old bad habits.