If you don't even think O'Shea is good enough to be a "first substitute" then you must want him sold this summer right? If we sold him AND silvestre then yeah I'd want us to sign a new reserve left back but I can't see that happening. My argument is predicated on O'Shea being good to cover the left back position as he did last season.
No, I don't think O'Shea should be the first substitute simply because he doesn't even have a constant position on the pitch, he's been moved around since 2003 and I wouldn't trust him entirely in an important game - especially against European top guns, in centre-back position.
I wouldn't have much problem with him on left side of the defence though, as he looked fine there when called upon. Problem is, if Silvestre goes, we will need a cover to the centre of defence as well, because Brown will most likely be used as a right-back again and that leaves us with Evans as the only cover.
You cannot count O'Shea as a back-up to every single position along the line, he could only cover one position at time.
I don't want O'Shea sold, why would I? Even if he's not a first substitute, he's a useful asset to have. In a perfect situation we'd have one cover for each position, but players get injured and even then he'd play about 20 games a season easily. How many times have we had both of our left-backs injured and had to play Richardson there in the past?
We'll actually have 7 defenders, because I wouldn't count on Simpson who hasn't done anything to suggest that he'd be ready to face strong teams and handle top European wingers. That's way too few for a team competing for the title AND the European Cup. If, for instance, Gary goes for a season again which might happen, we'll be left with 6 options.
Not enough, regardless of how good or bad O'Shea is. I thought we were short in defence last season as well, although with Pique's versatility and Rio being fit throughout the season we coped well.
Still, United's aim is to improve and another defender would bring a lot of confidence. If we lose two defenders and not replace them, we will get weaker, and why would anyone want us to do that?