I'd take him even if his legs are fucked.
He's got a good footballing brain, he's captain material, good in the air, his experience and organisation would help develop Zander and Andy C (which would be invaluable) and he's a talker. All of which we don't have at the moment.
Let's face it, you don't need to be quick at the back when you can draw fowls the way he can.
I just don't know where Seve would fit into the equation though as the midfield seems settled?