Manchester United’s record in the transfer market might be on the way to improving itself under Ineos and they’re off to a good start, but the legacy of failures is overwhelming. There are many expensive players who flopped at Old Trafford, or didn’t live up to the expectations and who else can that discussion start with than the costliest of them all. Paul Pogba returned to Manchester United in 2016 for a club-record and at-the-time world-record fee of nearly £89 million. READ MORE: Manchester United transfer history 2013 to present dayAfter an encouraging first season, it all started to fall…