Otamendi wasn't good enough last season. He spent more time on his arse than on his feet.
I think he's got more natural football ability than Mangala, but for what we paid, as an experienced pro, he was very ordinary. About the only time he looked anything like half decent was next to Kompany, and I reckon Kompany'd make most of us look like footballers if we played alongside him.
I'm sure he's one Guardiola is looking closely at to see whether he was badly managed or just doesn't have it for this league. I reckon it's the latter, but I hope he proves me wrong.
I imagine there's many of our players on the same ship as Otamendi... and the next few weeks will be the acid test of that.
As mentioned before, I think Stones will prove to be a good signing because he's English and has the raw attributes to suit the way we want to play, even if he ends up lacking the tools be a centre half and ends up in midfield.