Baldocks a cracking defender, but not a great wing back. He's wasteful with the ball in the final third. In a team like Celtic, who you'd assume spend most of their time trying to find openings against teams sitting deep, I'm not sure why they'd go for his type.
Baldock to Norwich, Watford, Burnley etc. would seem a better fit for player & club & he wouldn't let them down. As for price, I'd be disappointed not to get closer to £10m. Hard to find someone as fit, dedicated & strong defensively as he is.