There is much more devotional element in Krsnamacarya's teachings than most of modern yoga unfortunately. He did emphasize a lot of physical asanas to young boys who came to him first, but his emphasis shifted later on because of his devotional roots. I was reading this article about him
http://www.yogajournal.com/wisdom/465?page=10
Found two good excerpts :
Desikachar observed that, as students progressed, Krishnamacharya began stressing not just more advanced asanas but also the spiritual aspects of yoga. Desikachar realized that his father felt that every action should be an act of devotion, that every asana should lead toward inner calm. Similarly, Krishnamacharya's emphasis on the breath was meant to convey spiritual implications along with physiological benefits.
According to Desikachar, Krishnamacharya described the cycle of breath as an act of surrender: "Inhale, and God approaches you. Hold the inhalation, and God remains with you. Exhale, and you approach God. Hold the exhalation, and surrender to God."
BKS Iyengar's emphasis on asana didn't always please his former teacher. Although Krishnamacharya praised Iyengar's skill at asana practice at Iyengar's 60th birthday celebration, he also suggested that it was time for Iyengar to relinquish asana and focus on meditation and devotion.