I beg to differ, BK DNÀ is on one thing, a portable item, which in theory could be carried by anybody, I don't know how BK took care of his possessions, so I can't say if he has ever lost or mislaid items, but it is a possibility, the DNÀ in blood on the bannister is a fixed sample, the DNA on the knife sheaf in theory could have been carried into the home by anybody including BK, but all the DNA on the sheaf speaks to at present if the FIGG analysis remains is that at some point BK touches the sheaf, the state then has to walk BK into the home carrying the sheaf to the exclusion of anybody else and IMO leaving unknown untested DNA allows SODDI