I just started using LOOT for Skyrim and without even adding any mods, I see that Dawnguard.esm, HearthFires.esm, Dragonborn.esm, and Update.esm(still not sure what this one is for, if anyone cares to explain) all have 50+ ITM records(as well as deleted references and deleted navmeshes) yet Skyrim.esm has none of these. Will these ever be a problem or are they safe to clean out? I also am wondering as to why these are even on a completely vanilla games master files.