A little confuse..POSSIBLE SPOILERS

Hi everyone since this my first post.
I've got a problem...i just did the Sunjiang district, beat it and ended up at the HzH. I've read other threads where other people were talking about beating Shiro and getting green items...sooo did i miss something? Or is this coop actually after i join a faction? I'm sorry if this was asked before..pls bear wih me.

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SPOILER
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You havent defeated Shiro totally yet. Theres another encounter to come.

Thanks..that was a relief

So i guess i have to do the kruz quests etc to unlock the new coops?