If he was only 1/13 I could accept the bit about his guildies. But they're 7/13. Which means that they're a decent chunk into the more challenging HCs. That takes a degree of dedication and preparation, and not just mindlessly throw themselves at a boss till it drops.
My theory is that you see threads like this popping up every time we get close to the end of the current raiding tier. For some reason it's very...VERY important to a lot of people that their armoury raid reading is full of clears of the previous tier while it was valid. But is it worth it at the end of the day?
For me, the answer is "no". But it might be "yes" for the OP. He just wants our advice and I'm just giving my 2c.