Some have suggested that ?walking upon the sea? story of Mark 6:45-51 was based upon an older resurrection appearance story that Mark misinterpreted. The similarity to Luke 24:36-7 (surprised disciples seeing what they took to be a spirit) suggests that Mark misunderstood his source?s use of the expression (epi)?on? ?on the edge of? the sea, changing the meaning from a sighting of the dead Jesus walking by on the seashore to walking around on the water surface. The new version had great attraction as it mirrored the tales of rival sects and cults whose godmen and sages had walked upon the sea and calmed the winds.
I seem to remember Leolaia discussing this possibility in an earlier thread and would welcome any further thoughts.