i've been saying this fora couple weeks. i think it is Bungies idea to collect data - showing that because there is a burn - that zhalo is the only primary being used. they will then use this data collected to point out why Elemental primaries will not return, because then that is the only gun being used. and doesnt' fit into their diversity plan - where a lot of different weapons can be used. why else would we have Arc burn on heroics for, what, 3 straight weeks now? and now the Nightfall is Arc as well. just seems funny that the burn just happens to be the only one we actually have a Primary for.