The last time a thread about this popped up two of the posters who claimed to have gotten an uchi or a smug as their first five had screenshots in separate threads from their tree planting ceremony. A user pulled those images to the thread because both of them showed their first 5 did not include uchi or smug.
People claiming they had it are mistaken, it was their 6th villager, you just remember them being there early. No one has ever provided definitive proof that their first 5 contained one, and the resetters consistently confirm that uchi and smug are never in the first five.
With that being said, until there is a tree planting ceremony screenshot containing uchi or smug, I'll stick with the evidence.