xG is an advanced analytic metric used by data scientists and people that work in football, including managers. It measures the underlying trends in games because the basic data like goals scored can be misleading. It's through looking at this data that Mourinho was desperate to sign two new centre backs after only conceding 28 goals in a season. That's because xG told us that despite the low goals conceded column our defending was actually very poor, even in Mourinho's largely negative approach. In that particular season we were bailed out by some luck through bad finishing but also by an incredible goalkeeping performance from DDG which saw him voted as the best keeper in the world by his fellow professionals.
We've played defensively since Fergie left.
These are the goals scored and xG under LVG
14/15 goals scored 62 - xG 54
15/16 goals scored 49 - xG 45
Under Mou
16/17 goals scored 54- xG 58
17/18 goals scored 68 - xG 59
18/19 goals scored 65 - xG 68 - this was the season Mourinho got sacked and Ole came in, we had a great run after Ole signed.
Under Ole
19/20 goals scored 66 - xG 66
So again this underlying data does not support an idea that were surrendering attacking impetus to 'babysit' Maguire, rather that our attacking has been it's most potent with him in the side in the past 6 seasons whilst also improving our defensive solidity.
I do think that AWB and Shaw are much bigger issue than Maguire in games where we face the low block. The idea that Maguire should be expected winning the game in attack against sides like Arsenal is fanciful, ironically he still made as many key passes in that game as the attacking midfielders and came closer to scoring than any of the attackers on Sunday!
That said, there are improvements that need to be made if we are to challenge. I think AWB , as great as he is when were play deep, is a liability when the opposition does. A liability to the extent where the opposition leave him as a free man because they know that he's unlikely to affect the game in attacking positions and that he takes so long to get the all under control they can get back into shape easily.
I also think that we need some pace in the centre back positions because the inability to push up the centre backs is a problem. Although I'm a fan of Maguire I'm not under any illusions that he's a world class centre back but I'd sacrifice Lindelof out of the two.