“I don’t understand this- you are saying that Leah was not a tzadekes because she was a BT?
How was she different from her sister Rochel who grew up in the same home as she did?“
There is the “Tzadik Gamur” and the “Baal Teshuva” This does not end with Rachel and Leah it is a theme that continues through the unique Avodah of the Bnai Rachel and Bnai Leah (Yosef and Yehuda) down to Shaul and Dovid and beyond (ultimately to Mashiach Ben Yossef and Machiach Ben Dovid. I recently read a nice work elaborating on this subject.