Taegon Yi was a homeless child stealing crumbs for survival he didnt have time to train and didn't become a martial artist until later in life. This does not apply to him. But it does to Mikey since he indeed has been training since 4 and even lives inside the place he trains (his family dojo owned by his grandfather)
Mastered Shotokan at age 4 to the point Baji questioned him and his grandfather on why he still trains,
Ripped Sanzu's mouth apart with his bare hands using another form of disarticulation called amputation(literally called his special skill so you cant dismiss this)
Kicked sealed bottle tops off since the same age
Mastered drunken boxing on his first attempt and then sleeping boxing by accident(it said to be his success story on his character profile)
Keep in mind everything i just said is Mikey before he even creates Toman.
I want you to do the same for post sophia daniel because as i stated before. Literally all of his skills are based off assumption from his 2nd body and its stated multiple times the original is not nearly as skilled.
But they don't have nearly the same influence as Mikey even if thats true. Mikey at that stage was becoming fhe #1 criminal in all of Japan. Not just an area,
he controlled all of the country and had a hand in all crime. Not some, but ALL. They couldn't even be touched by federal authorities. Nobody up til Post-Sophia or even as a whole in the series has that type of social influencing.
Mikey went from being held down by 2 people having his skull repeatedly smashed by the 3rd person, to winning in an instant.
It does matter, if it didn't matter they wouldnt mention this more than once. He can't even do every technique his 2nd body has due to the height difference, which was also said. You are leaving out details that they explicitly state for a reason. They just made him taller recently.
For starters any punch/kick daniel throws can result in his limbs being broken since he uses it as a counter move. Which is what happened to South. UI Daniel did something similar to Gun, but was by brute force. Not disarticulation.
Daniel also has been caught off guard by less. The Big guy raised by Gorillas punched him in the bathroom when he captured him, Taegon Yi caught him off guard when he fake yawned and hit him in the chin. Its many ways he fan be caught, even when he does the spin kick he can be grabbed and have his leg broken or amputated