So basically only my BTL matters?
In regard to LSAC GPA it seems so.
You would only have to send in transcript from schools you were in prior to receiving your BTL (or First Talmudic Degree If you are in New York State).
However, you can and should put your other degree, as well as your GPA from there, on your resume.
The GPA the school will report in their admissions report will presumably be the one from your BTL so that would probably hold more weight.