Maybe he has, but that won't be yet awhile. He is at least two seasons off that in my view. Still a young keeper, and continuing to make good progress, but it would be wrong to promote him too early. Another couple of loan seasons will do him good.
Yes, l feel sure Walton will spend at least one more season out on loan, (probably at Wigan again), promotion to the Championship will test him more, and give Chrish Hughton an idea of what he might be capable of at a highr level.
I'd like to see Tim Kruhl stay for another year as number two...