Yeah you didn't earn it at 310. But me and my 310 super cell from a random engram drop. Yeah I earned it. Joking aside sorry to hear you mistook there subtle hint to infuse them while you could into your special weapons. Aside obviously from the one they where going to reset to 280- 290 respectively. I infused my Susanoo warlock fusion rifle with mine. Sitting at 309. Still not sure about the reason behind dropping it though. As you and everyone else who's done that Daily know it's a real fight to the end of that 10 minute timer.