The thing about Vauthier is that he is basically a dj of 80's fashion. It's not necessarly YSL because it's the only name we like to reference from that era, in this type of fashion, but he is referencing Ungaro, Balmain...etc.
I think that he would do a wonderful job at all those houses, from YSL to Ungaro because he still got that sharp and graphic vision.
Let's be honest, he is limited as a designer but he comes from the school of Couture and his clothes are luxurious and really well made. He could benefit a lot from working with archives.
His RTW line is just an extension of the couture. The only difference here is that it doesn't have the craftmanship of Lemarié, Lesage and everything.
I wonder why nobody has gave him that kind of job yet...