Of course, but opportunities like this come once in a generation.. a potential generational great (both him and Varane are that type of talent) and even if its in a position you don't necessarily need to strengthen, if you can get him at a bargain price + big wages, you've got to go hell for leather for it. Especially as when it comes to CB's, fitting in two great CB's is less problematic, to just signing a great attacker who has come on the market for the sake of it (even though chemistry wise or position wise, he isn't the right fit). FWIW with him being a lefty, and more silky than Bailly.. they'd have great chemistry IMO.
But yeah like you said, very unlikely to happen but one thing Jose has up his sleeve is the ability to make impossible signings.