Donald Fouke's description of the Zodiac Killer was very similar to the three teenagers, so much so, his only deviation was the suspect was "older and heavier", the rest was apparently in tandem. What we can take from this, is Donald Fouke is pretty much in agreement, that the unknown white male he saw, is the same man observed by the three teenagers at Washington and Cherry, particularly from a facial standpoint, because he did not disagree with the composite. and if he did,
he didn't say so in any subsequent interview. Therefore the man walking down Jackson Street not being the Zodiac Killer can almost be ruled out, especially since the timeline of "about 3 minutes" from Zodiac leaving the taxicab and Donald Fouke reaching the intersection of Jackson and Maple from his position when receiving the dispatch, is on a collision course for this intersection.