Maybe duplication errata of Avigdor Kara died in 1439

The known Avigdor Kara was brother-in-law of Rabbi Yehuda Loew, The great grandfather of Maharal (Sources are attached to this profile).
This profile present Avigdor Kara as brother-in-law of Yehuda Bezalel Loew (Hamaharal), Suspiciously similar to the documented people above.
The source of this profile in LoebTree, need better source.

Rabbi Avigdor Kara info:
http://www.jewishencyclopedia.com/view.jsp?artid=103&letter=K
http://he.wikipedia.org/wiki/%D7%90%D7%91%D7%99%D7%92%D7%93%D7%95%D...

The old Rabbi Yehuda Loew profile:
http://www.geni.com/people/Yehuda-ben-Bezalel-or-ben-Yitzhak-%D7%99...