Tisha Baav - Bitul Torah or The Big Three?

The Gemara in Yoma 9b says the Mikdash Rishon was destroyed because the people did Avodah Zarah, Giluy Arayos, and Shfichas Damim. However, the Gemara in Nedarim 81a says even the Neviim couldn't figure out why it was destroyed, until Hashem revealed it was because they weren't careful about Birchas HaTorah. How do we resolve the seeming contradiction between these two Gemaras? The approaches of the Kochvei Ohr, and the Chassid Yaavetz. Have a meaningful TIsha Baav