you are just stuttering, what single 'argument' can prove Nick's talent? or lack of? it's absolutely nothing to do with what you think are the deficiencies of his game. I'll repeat for you again, it's a different concept to talent. If I sink a level or two and attempt to put it in a low level thinking description, i'll just say this...…..Nick finds a way to lift his overall level that's enough to beat or come close to match the best players, most of the time, and the same can't be said of almost all the other players....it's irrelevant what you think of his serve, fh or bh, or even his mental, and certainly nothing to do with how he fares against lesser players in early rounds, in which he would continue to either not show up or blow up in future as well.
So yes, the judgement from those who know him the best, have played him, has to be the strongest indicator of his talent level. Since it can't be measured in absolute terms, your beloved 'argument' of his fh, bh, accomplishment, all that is bullshit. You can try and refute when one says so, but not a group of them. In that case, my same question for you...….what makes you think you know his talent better than those who played tennis all their life, have studied Nick professionally and played him in real matches?
Answer that question before you talk about your worthless argument.