Borna could play in the EPL no problem as well but Kent has a higher ceiling. He's genuinely looking unplayable this season.
The fact Bielsa has been so keen to sign him will alert other clubs to him as well and they will be taking a far closer look at him now.
His talent has never been in doubt, he is now adding that end product to his game and looking far more of a goal threat rather than just a tricky winger who beats players in the wrong positions without really impacting the game in terms of goals / assists. The coaching team have clearly worked really hard with him in terms of getting himself into goalscoring areas of the pitch more often.