All you really need is the updated hekate, updated atmosphere and its sig patches. Kosmos is more aimed at noobies who don't know what to download to get them started
So, can you explain for a newbie how to move from the most recent Kosmos to the most recent Atmosphere? And what is the safest firmware to stay on? (I am currently on 8.1 with the latest available Kosmos + sigpatches)