In the history of KPop, the larger companies tend to get the best potential trainees, and that translates into the best members.
For many years, there was a list of people JYP lost and he regrets losing them.
However, after the dust settles, few of them end up better than the people JYP chose in the end.
Objectively, only three of the people JYP had lost ended up better than the people he chose.
No need to say any more about him and JYP
She was actually cut pre-audition, but she is often cited on the list of people JYP lost. The truth is , JYP still managed to get some utility out of her, with the song 'Someday' (which itself has some history which I will skip today).
And JYP didn't lack female soloists, like Jamie Park, Baek Ayeon and Baek Yerin. Baek Ayeon did score the only music show win for JYP organization in 2015 and did her worth, and the other two , while more successful after leaving JYP, did carry their weight while JYP was busy on something else.
He was also cut at pre-audition. He was quite obese back then. What happened him after he joined SM needs not to be told.
So, other than these three, two of them cut before they were seriously considered by the JYP organization, none of the people JYP supposedly lost ended up bigger than a JYP act (and I am not talking about acts like Day6, which has a different focus).
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Ennik 'Somi' Douma might join the list. Since she recently danced with Chaeyong (Twice) I don't think she has an animosity against JYP, and in any case her style of music was not something which she would do while being under JYP. So, she might become the second true talent JYP has actually lost.
It is interesting that both of them are not Koreans. Jay Park is an American and Ennik Douma is a Canadian.