Questions & Mysteries Why did Oda throw away Jack?

Because jack was fighting a side character

King and queen are fighting two of the most important characters in the whole Manga

The reason for that is simple, had jimbei fought jack, he would've been paired with zoro and sanji

And obviously oda doesn't want to change the monster trio dynamic so he had jimbei fight an opponent on the same tier as Franky and Robin's

Leaving poor Jack alone