I personally grade rather harsh but only because I have high standards but the pictures in your first post to me would be a 3/10 and his father would be a 1/10 to me.
The first fh that I rated 3/10 has a decent sized kok and nice body shape but his fins,washed out colors, single flower line leave him in a "low grade" imo. To me thats a normal male mature fh which isnt anything special.
The fh in the youtube video to me is a medium grade fh, a 6 or 7/10 which I personally like.
His father to me is HORRIBLE. Thats what I hate about the fh hobby now days. Huge over sized kok's that's even uncomfortable for the fh that just screams hormones, bad diet looking at his condition, and having a flowerline that is bleached out along with disgusting coloring imo. Looks like that fry took his mothers side which I'm sure is a better quality.
But then again those are my opinions and that's how I grade so its all subjective. Different people grade differently so if you personally like your fish thats all that matters. Its true some ugly ducklings can grow into decent fh's if the genetics are there but if you see their parents are low quality, chances are very slim to get any sort of stunner.