I don't think this is necessarily the response you're looking for.... but I would say it is this.
All of these highlight clips are just that, highlights. So when someone here points to that as proof.... They're pointing to a marketing presentation to prove the quality of something.
Have you ever seen an accurate fast food commercial? No. The sandwich you usually get is smashed almost flat with the meat often halfway off the bun. The people eating those sandwiches are almost always thin, healthy, happy, attractive, friendly, sexy,.....
These highlight videos show what the player and his helpers want people to see to get him the best offer possible.
MOST of the time with higher rated players, a kid is special enough for the recruiting sites to either see them in person or watch whole games. With the lower rated kids, coaches and their paid recruiting services look for players they can develop based on all of their film plus any other info they can gather.
Bottom line. The videos available to us do not provide even CLOSE to a basis for declaring a kid underrated.