Harry Kane could provide a crucial link that potentially leads to a blockbuster commercial deal for Tottenham. Spurs legend Kane left the club for Bayern Munich last summer and, despite failing to end his own personal trophy drought, enjoyed a stunning individual season in Germany. Tottenham meanwhile started brightly but faded under Ange Postecoglou, eventually finishing 5th in the Premier League. The manager therefore is targeting a summer overhaul in the transfer market. Daniel Levy runs a tight ship at Spurs, with their spending tied closely to their revenue. That means commercial income i…