Sad day indeed, great player, he's up there amongst the best of all the centre halves, I've seen play for United in my 50 odd years going to the Lane. And he is probably THE best since the turn of the century.
Don't think it's quite that simple.
It's like many things, some players are only good when used to their max.
Take Basham, average league 1 standard as a midfielder and average league 1 standard as a centre back, his strength was versatility and attitude.
However play him as an overlapping centre back and he was brilliant, great stamina too to get up and down the field.
I believe O'Connell was 4th choice centre back at Brentford and was't exactly rated as centre back.
Let's not forget he was average in our early matches too.
It was only when he was asked to push forward and play as overlapping centre/ left back where he was brilliant.
This is because he's played many years as a left back and was an excellent crosser of the ball.
It's such a shame he got the injury when he did.
We were never the same team because without 2 overlapping centre backs (Basham and O'Connell) our threat overloading wide areas disappeared.
My view is that very few centre backs in the world can play "overlapping centre" to a high level.
You need a player who is as strong as a full back as they are as centre back and also they must have great stamina and intelligence to know when and where to go.
It was a great slice of luck that we happened to have 2 centre half on our books who had all the attributes to play that specialist "overlapping centre back" role.