if one considers that narayana has a form ie., a body form,he has to also lose the body form at one time or other-Natural principle.krishna had a form..kasthuri tilakam lalata phalake,vakshsthale kausthubham..lovly form.All the sages of treta yuga took birth AS gopikas to have the grace of lord.Krishna is purna avatar of lord narayana.krishna is not naryana.you see change in the name.But if one feels that krishna is narayana with full heart..it is fine.in narayanopaishat it was given 'kalscha narayana,indrascha narayana,rudrascha narayana...all are manifestations of narayana.Brahma is the creator ,while narayana organiser-sthithi karaka,shiva power of destruction.these three powers on combnation is viratpurusha or parabrahman or truth.KRIASHNA WAS A GREAT BRHAMA JNAANI.HE GAVE LOT OF PREFERENCE TO KARAMA.EVERYBODY SING THE GLORY OF LORD KRISHNA TO LISTEN TO THE LULL MUSIC OF HIS FLUTE.regards,subrahmanyam