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...
The "known Avigdor Karo" is at
http://www.geni.com/people/Rabbi-Avigdor-Karo-%D7%A8%D7%91%D7%99-%D...
Here the source for Avigdor Kara was brother-in-law of Rabbi Yehuda Loew, The great grandfather of Maharal.
http://www.hebrewbooks.org/pdfpager.aspx?req=29088&st=%D7%9E%D7...
Moshe Nachman Tal Yigal Burstein Private User Moshe, Thank you so much for sharing your wonderful Hebrew Books source, it will be very helpful in our future research, and for taking the time to point out this profile that needs more investigation.
http://www.hebrewbooks.org/pdfpager.aspx?req=29088&st=מהר%22ל+מ...=
Moshe
I am not clear what new information you are trying to give here.
As you said in your first post, there is a reference to that book as the source in the About Me of the profile http://www.geni.com/people/Yehuda-ben-Bezalel-or-ben-Yitzhak-%D7%99...
[You referred to it as "Sources are attached to this profile"].
Second, you said: "The known Avigdor Kara was brother-in-law of Rabbi Yehuda Loew, The great grandfather of Maharal" and again "Avigdor Kara was brother-in-law of Rabbi Yehuda Loew, The great grandfather of Maharal"
I am not seeing him as the brother-in-law. I am seeing him as the nephew.
Rabbi Avigdor Karo - רבי אביגדור קארו is Yehuda ben Bezalel {or ben Yitzhak} / יהודה בן בצלאל הזקן, המפורסם's nephew.
http://www.geni.com/path/Yehuda+ben+Bezalel+or+ben+Yitzhak+%D7%99%D...
The Hebrewbooks source also says this on page 19 to which you referred us in your post:
בן א ה ו ת ו של ד׳ יה ו ד א לי ו ו א י הז ה הי ה הג א ו ן מו י א ב י ג ד ו ר קר א אב ״ ד
י דק׳׳ק
Forgive the OCR errors - the meaning is clear - and you can find it yourself at http://www.hebrewbooks.org/pdfpager.aspx?req=29088&pgnum=19
You may be telling us something new here - I am just not sure what - and I would be grateful for clarification.