Isco is probably the only player in the world who is closest to Hazard in terms of playing style, it is only natural that Chelsea look to Isco as a replacement for Hazard. Isco is also limited by the style of the team he plays for. In the Spanish national team, where it is a lot of quick passes and flicks, he is phenomenal. But in Real Madrid, where there are a lot more crosses and long balls over the top, he looks a bit lost.
Isco seems to spend a lot more time on the bench of late, and is not getting enough minutes to keep him happy. It is understandable that he wants a move away from the club and somewhere he will surely start.
What better place than Chelsea then? But it will come down a lot to who is in charge there next season.