Through the spiritual master it is Lord Krsna who delivers the devotee. The same principle of samsara dava.. the cloud that is raining down the mercy - the spiritual master is that cloud who is extinguishing the burning fire of material life ,samsara, but he gets his mercy from the ocean of mercy which is the Supreme Lord. So the spiritual master is acting on behalf of Krsna...
Every devotee, from the day that we come to the sankirtan movement, we are getting a little receptacle, a little container by which we can distribute mercy, and over the years that container may grow.
(Kadamba Kanana Swami 2003)