5 months is more than enough to clear 16 bosses normal if you at least raid twice in the week for at least minimum of 2 hours per raid. If you and your guild can't do that and can't put an efforts, dedication, and commientment then this is not Blizzard fault it's you guys sorry to say this. I'm not saying being not having time and dedication is bad playing this game of course not because in the end this is just an entertainment video game but to demand the same treatment and rewards just because you pay for the game is just wrong. you put an effort and dedication? you gain, if you are not? you don't gain as much. It's as simple as that.