Sébastien Pocognoli grimaced on Friday when recalling his playing debut for Belgium. Alessandro Del Piero and Italy discovered favourable opposition when preparing for the 2008 World Cup. Pocognoli will also look back, in time, at his maiden game as the head coach of Scotland. Blue skies, a dainty stadium in Ljubljana and a second half display that provided glimpses of optimism about Scotland’s world post-Steve Clarke. The best-forgotten first 45 minutes can be explained by a squad operating un…