The buy-in from the investment arm of the San Francisco 49ers and Red Bull is a significant endorsement of Leeds United’s brand – regardless of what division they are in. As yet, no details have emerged regarding the scale of Red Bull’s minority investment earlier this summer, but it is believed to be a significant stake. When the 49ers bought Andrea Radrizzani out last summer, the club was valued at £170m, down on a reported £400m had they retained their Premier League status. At £170m, the US group will likely feel they have secured something of a bargain. Yes, infrastructure investment is n…