The Zapruder we see on the Bell Film is Meandering around the area close to the Zapruder Perch. He appears to be doing likewise in Altgens 8. This Contrasts with the High Steppin' gent we see on the Paschall Film above.
Of course the Photographs and Films that you mention contrast with the Paschall clip which I posted above.They show Zapruder's movements at completely different precise locations, and at completely different precise moments in time, all recorded within a very short precise time frame.
Are you contending that: (1) Zapruder suffering from Vertigo jumped down off the pedestal unassisted and then Sprinted eastward as we see on the Paschall Film, and (2) then Suddenly threw it into low gear and began meandering around the pedestal area as we see on the Bell Film? If so, you are getting warm. Simply expand the running time Between these 2 films and add 1 to your current cast of characters. The Sitzman version of this same time frame as told to Tink Thompson less than 3 years after the assassination provides a rational explanation for the current Dr Jekyll and Mr Hyde performance being attributed to Zapruder.
There is Nothing "logical" as to the movements that have been attributed to a Vertigo suffering, overweight, 58 year old man. Sitzman's narrative checks all the boxes and was her 1st in-depth/detailed interview. The interview was also conducted by a very respected individual. The interview Tink Thompson did with Sitzman was Far more detailed than Anything that was ever done with Zapruder. This would include Zapruder's testimonies.
The movements of Zapruder and Sitzman in the recorded visual records, are the only true records of the movements of Zapruder and Sitzman in those specific recorded visual records.
Nobody currently alive can with certainty ID the Fuzzy, nondescript images we are discussing on the Bell & Paschall Films.