Not sure of the relevance to my post though Carana. Do you think it's credible that SY, at one point, believed there were two almost identical men carrying an uncovered child around PDL on the 3rd ?
I have no idea what the Met may have thought. I would hope that once they interviewed the person they believe could have been Tannerman, they'd have also checked if he could also have been Smithman - not impossible if Tannerman aka likely Crècheman had some reason to stop off somewhere en route.
As the appeal was to concentrate on the later timeframe and Smithman, the two are presumably not the same unless Crècheman had said that he was also there and the Met have a reason to doubt it and are asking for corroboration.
In any case, just because there were two sightings of someone carrying a chid, it doesn't mean that either sighting is correct. Whoever took her out (assuming she didn't walk out by herself) could also be someone who no one happened to see, possibly going in a different direction.