Newcastle United have already lost out before the transfer window has opened. Now, Tosin Adarabioyo may not have been Newcastle’s leading target after all but to watch him join Chelsea is obviously a blow. The chance to sign a Premier League-proven defender on a free transfer does not come around particularly often, even if Newcastle look to be doing something similar with Lloyd Kelly. Generally, it is rarely something that the club will have the luxury of. As much of a blow as it is, it’s obviously unlikely to be season-defining. Still, what’s important from now is that Newcastle don’t contin…