Joe Ledley was a great signing for Celtic back in 2010. Joining the club on a free transfer from Cardiff City, the Welshman has four successful years at the club. The Welsh midfielder proved to be an astute piece of business by Lennon and went on to win three titles and a Scottish Cup. Ledley was also involved in that famous win over Barcelona and scored the winning goal in a 1-0 win over Rangers in his first season at the club. Mulgrew played second fiddle to LedleySo why does Ledley say he feels sorry for Charlie Mulgrew? Ledley was Neil Lennon’s second signing of that summer but was bizarre…