Brawl should absolutely allow the renaming of teams. In fact, I think coming up with a team logo and backstory should be in Round1!
All this 'represent an element' nonsense is detrimental to the quality of the community and its events. The only events that should use elements are the ones that rely heavily on color bias in PVP (such as War). Other than that, all it does is divide the community, or even favor votes due to it being "omg entrpoxnx my favorite elementzorz". Heck, in this particular instance, it shows just how little activity we actually have - 12 teams is way more than we're going to see fielded in this Brawl. It's ridiculous and pointless to limit user creativity this way.