I assume that the op is looking at settings / more / storage ... where the 16GB is broken down. Attached is how mine breaks down. Misc is a lot less than 6GB on mine (my misc is 1.2GB including 491MB thumbnails (!), 265MB of my own personal files I placed in a directory, 132MB for Osmand map program). All stuff that makes sense except maybe the thumbnails. And mine also ads up to the 1.2gb. So I don't think it's the built-in bloatware. Something else... most likely one huge file or directory. Odd that it doesn't show up with DiskUsage...
I'm vaguely remembering hearing on the forum that someone had a lot of data tied up on the storage due to some backup selection they made during phone setup. I'll see if I can find the link..