By Grey Whitebloom “You cannot compare [Nicolas] Jackson now with Didier Drogba,” Mauricio Pochettino warned during the new striker’s first season at Chelsea. While the departed Argentine coach would be right to avoid judging Jackson by the lofty standards of Drogba’s entire Chelsea career, the two characters enjoyed and endured similar starts to life in west London. Both arrived as exciting centre forwards tasked with immediately transferring their goalscoring feats on the continent to the Premier League. Jackson is at an earlier stage in his career compared to late-blooming Drogba, who joine…