Facundo played a significant role when he was loaned to Leicester City. His name may be unfamiliar to us, but that's because he only played for mid-table teams. As far as I know, Chelsea didn't make a purchase, only a one-season loan option without a buy clause. I don't think it will be detrimental to Chelsea, besides, there are names like Marc Cucurella, Robert Sanchez, and Moises Caicedo who have had previous relationships with Facundo, so with that relationship, he should have no trouble adapting, and more importantly, he could be a good replacement for the squad.
I have read this news, it is true that Chelsea is loan this player without an option to buy at the end but the situation could be different if Facundo Buonanotte can take an important role in the squad this means that the opportunity to make it permanent is still open. I also wonder why Chelsea are looking at this player as he is rarely in the spotlight, Maybe Chelsea has other plans, for example to make it a long-term investment? at the age of 20 this should be the ideal time to forge new talents, but if in the end it doesn't meet expectations then the player will be returned.
One of the signs that Facundo Buonanotte has a future is that he is one of Dortmund targets, we know Dortmund as a team that produces new talents so Chelsea doesn't want to miss this opportunity, if they can get it at a cheap price why wait for the expensive price.