I doubt the IG had access to corroborative sources to properly place Mifsud. I have said since the release of the Mueller Report that Mifsud had to disappear soon after the election and the Devin Nunes investigation because he was proof that the Trump counterintel op started prior to July of 2016.
Mifsud worked in Europe; Mifsud worked through FVEY (Link Campus); unless Ohr or Comey ragged out Mifsud's name to Horowitz he would have no way to document Joseph Mifsud's involvement in Spygate - no matter what his suspicions were. Mifsud was only peripherally connected with the FBI; he was recruited by Brennan or Halper, maybe Dearlove.
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Right. That's the point. Horowitz's investigation is missing all the "Origin" pieces which were outside the DoJ and FBI, probably with Brennan/C_A.
It's like Horowitz could only analyze one corner of a photo, and not the most important corner.