He obviously didn’t see Gerry and Jez or he, and OG, would have been absolutely positive that he was Tanner’s sighting and, again, having walked down that road myself ( there is no camber in the road ) I think it would have been all but impossible for Totman to have seen Tanner and not Jez and Gerry, as he would have had a clear line of sight.
The point is that there are two ways of viewing Dr Totman's journey home from the creche carrying his daughter.
One is the route which indicates he was walking in the wrong direction and requires speculation to make it fit which just goes not work.
The second is to leave the creche and proceed uphill
** on R. Dr. Francisco Gentil Martins and turn left onto R. Dr. Agostinho da Silva.
** Google Earth appears to show an incline and in my opinion a slope is confirmed by there being a stair into apartment 5A from R. Dr. Francisco Gentil Martins while the front entrance to the apartment from R. Dr. Agostinho da Silva is on the flat.
The second requires no invention or speculation to explain the route Dr Totman walked with his daughter because it is the route one would expect him to have taken.