Unacceptable behavior by the top 16 guild.

[Chaosbreed]

You are using him to kill bosses.
You are saving him for your fun.
You choose to kill the boss later, even without him.
You blame him for stealing "YOUR" save.

This is a really fun story. It is his save too. He has no chance to kill mythic garrosh in another raid and you know that. If you are so worried about "your" save, do not invite random people.

[Varabently]

I feel like this is not the appropriate venue for this post. Take it to the GM of their guild or report it to Blizz or something.

[Darsithis]

Naming and shaming is forbidden here.

Closing.