When Devotee has slightly inclination towards Divine-God he is blessed with the abundance power of Divine.

Sanjay stated — O King! Saying this MahaYogeswar God Shree Krishna displayed His grand Divine-Form to Arjuna. (Bhagwat-Gita: 11/9)

The statement of Divine-God that Arjuna cannot view Divine-Form with given human nerve system through which human sense anything and therefore Arjuna was granted Divine-Vision, refereeing this Sanjay is explaining this stanza.

Arjuna has addresses Lord Krishna with “Yogeswar” which denote Mater of all Yoga, here Sanjay has addresses Lord Krishna as “MahaYogeswar” Grand Master of all Yoga, because Lord-Krishna has displayed his Grand Divine-Form. When Devotee has slightly inclination towards Divine-God he is blessed with the abundance power of Divine.

The form of universal Divine is extraordinary therefore “MahaYogeswar” word was used to designate Divine-God. The form was such that brave Arjuna who had attended divine vision was also afraid (11/45) and Lord Krishna had to pacify Arjuna (11/49).