The strongest answer to almost all of your questions is "Poverty of the stimulus" (wikipedia). 4 year olds are exposed to an almost microscopically tiny amount of words relative to chatgpt (you can probably contain it in a csv file that you can open in excel), and yet can reason, even develop multilingual skills and a huge amount of emotional intelligence from the very little word tokens they are exposed to.
So whatever is driving reasoning and intelligence in humans is clearly very different to what is driving reasoning in chatgpt.
People will probably respond by saying but babies are exposed to much more data than just words, this is true, but chatgpt is learning only from words and no one has shown how you can get chatgpt to sufficiently learn what a baby learns by other kind of data. Also note that even blind babies learn language pretty quickly so this also excludes the huge amount of data you obtain from vision as putting babies at an advantage, and it is very difficult to show how sensory touch data for example contribute to babies learning to manipulate language efficiently.
So whatever is driving reasoning and intelligence in humans is clearly very different to what is driving reasoning in chatgpt.
People will probably respond by saying but babies are exposed to much more data than just words, this is true, but chatgpt is learning only from words and no one has shown how you can get chatgpt to sufficiently learn what a baby learns by other kind of data. Also note that even blind babies learn language pretty quickly so this also excludes the huge amount of data you obtain from vision as putting babies at an advantage, and it is very difficult to show how sensory touch data for example contribute to babies learning to manipulate language efficiently.