After two-and-a-half years of huge expenditure under Todd Boehly and Clearlake Capital, Chelsea are operating on a narrow financial runway. The £1.5bn the Blues have spent under the current owners is, for context, roughly the same as Man United have spent since Sir Alex Ferguson retired in 2013. The gamble from Boehly and Clearlake, who are locked in a battle for control of Chelsea, is that the younger profile of player that have been recruiting will pay big dividends down the line. That, combined with an eccentric approach to the club’s commercial arm and grand plans to expand or rebuild Stam…