Emperuman Kannan granted salvation to the pot of Dadhipandan, does this mean a soul resides even in the insentient pot?

Yes, a soul is inside a pot as well. Souls do reside in all materials, says Sribhasyakarar. We do not perceive this as the wisdom of the souls in them is very minimal. As the soul is present in all materials, granting salvation to the pot is appropriate.