Board Thread:Theories and Speculation/@comment-44142243-20200416151624/@comment-32685487-20200422004135

You are also ignoring the possibilities, it could have been sealed in a scroll or something and Itachi unsealed it and then somehow sealed it into his Susanoo for it to be used. We don't know the details of him finding it and you are assuming that him finding it means it was physical. Same with YM