Maybe so, but if you was Moyes and had 15m to spend in January and say you could get Alonso for that - would you?
Bearing in mind his wages and recent injuries...
I'd pay about 12mil for him if he wasn't so injury prone.
He'd be vying more for Osman's position than Carsley's and I'd say upgrading Carsley is more important than upgrading Osman.