The real reason that Hale End academy wonderkid Chido Obi-Martin now looks destined to leave Arsenal has been revealed. Chido Obi-Martin looks set to leave Arsenal in this summer transfer window. There has been huge excitement about the 16-year-old striker in North London for some time. Obi-Martin broke a number of Arsenal academy records with his goalscoring exploits last season. However, despite the Dane being one of the most highly-rated youngsters on the Gunners’ books, Mikel Arteta and academy director Per Mertesacker now seem to have accepted that they need to let him go. Manchester Unit…