Motherwell’s signing of Riku Danzaki took the number of Japanese players in Scottish football to eight, all of whom have arrived in the last two years. It’s been a growing trend, led by Celtic and their manager, Ange Postecoglou, who accrued knowledge of the J-League while in charge of Yokohama F Marinos for three years. Other clubs have started to follow suit as they expand the markets from which they…