So two blond men were seen in Luz and then two blond men were seen in Barão de São João. Eureka! They must be the same men, so it's perfectly fine to say that the men in Luz had the same colour eyes as the men in Barão de São João! Or is that a bit of a mental leap?
No "mental leap" required. It seems one witness was close enough to observe the eye colouring of these two guys probably initially noticing the green ones first.
As far as the eye witnesses describing blonde men in Luz are concerned. Many of them have given good descriptions of the men they saw inclusive of efits and these are the ones we know about, there may be more.
One whom if memory serves me well firmly dismissed Ney from the equation at a time when the media were looking in that direction. But she had absolutely no qualms in claiming Brueckner as the man she saw. She was always very definite about her description - so he must have made quite an impression on her.