A club like United need at least 3 CBs who can start. Look at the CBs bought by Pep: Stones 50 mill, Laporte 59 mill, Ake 41 mill and Dias 65 mill. At the same time there will always be one starting CB pair, as it is needed to get some continuity.
Varane is somewhat similar in style as Lindelof but better in all regards except on the ball and is a little more prone to mistakes imo. How good Varane would be in the future is hard to say. I’ve followed Real Madrid for a long time and seen him play at least 200, maybe 250 matches. I have always rated Varane highly but am a bit worried he has passed his peak. He would be a great contribution anyway.
One take away from the Euros: our defenders didn’t look that bad after all…
Shaw, Maguire and Lindelof were all pretty good compared to many of the “elite hipster” defenders playing for Spain, France, Portugal, etc. Then of course our defenders all played in very defensive oriented teams, sitting back in low defences in a way United don’t want to play, but were still good.