Former Dover boss Chris Kinnear told Jake Leberl he was mad to take charge at Crabble. Kinnear is the most successful manager in the club’s history across two spells, twice taking them into the Conference and challenging for a place in the Football League. Leberl played under Kinnear at Margate and served as his assistant manager at Hartsdown Park. He followed him to Dover in 2013, where the pair spent five years before Kinnear’s dismissal. The pair remain friends and it was only natural Leberl should seek his old mentor’s opinion when the chance to succeed Mitch Brundle came up last month. Do…