Even those devotees who, filled with faith, worship other deities, O son of Kunti, are in fact worshipping me alone, though not in the proper way.
Explanation
Krishna has just spoken of those who worship him with single-minded devotion. Here he says that sincere worshippers of other deities are also reaching toward him, since he stands behind every deity, though they do so without following the proper method (avidhi-pūrvakam). Traditions differ on this: some read it as broad acceptance of all sincere worship, others as a gentle note that worship of other deities falls short of the highest path.