The main problem is that almost none of them would concievably be found in Skyrim's wilderness and dungeons, despite being given retexes and lore-friendly names. Also, a lot of the new meshes are of Oblivion-or-worse quality, or just stolen from another game. IMO it's a waste of time working out what to get rid of. Much better idea.to work out what you can keep.

Although, rigging up a dragon to a horker's skeleton is hilarious.