They are NOT dating at all because if they were Simon Cowell with his pal Max Clifford would be making sure that there were zero stories like this in the press. Cowell is the master of cover up and this is far too in your face. So its not happening despite what people would like to think.
I would be inclined to agree with you on this. I think Nick Grimshaw has realised that he's not as "cool" as he's tries to make people beleive and copies Harry Styles to cover his fraud.