One more thing I'll take from the other thread is Mrzz's post, because it was so good, and perhaps he would be too demure to repost it:
"It is a fine post and we agree that it all boils down to what you call "talent". In the end this is a huge word and a lot of things can be described by it. Kyrgios has a very interesting feature which is his unpredictability -- which is a "talent", I concede, and that is the main part of that unknown element of competitiveness you mentioned -- but I disagree he can "execute any shot". If he can... why he doesn't? The problem with the eye test is the selective memory... he attempts a lot of difficult shots all the time, hits hard, goes for the tweener, etc and etc. He misses a lot and connects a few. You simply cannot judge his "talent" by the few he connects... But, one thing is that he chooses very well the timing for some shots... not in a shot selection sense but in a highlights producing sense (and those affect the opponent, as he knows quite well). That is, again, a "talent" of his own.
He is one of a kind, and I agree with that. In the past my notion of "talent" was more narrow -- more technique oriented -- so I was harsher on him. Looking at the complete package, I think he is, well, a different kind of talent. (we had a thread for that and maybe we should revive it).
To try to avoid an impossible definition of talent, I try to break the game in three "dimensions": physical condition, mental strength and talent/technique (those two go hand in hand, even if I understand the difference). Now it is obvious to me that Kyrgios has a very good physical condition: he is tall and strong, and can be pretty quick. His reflexes are extremely good as well. The mental strength is the part I disagree with most: people think that this is his liability, I think it is the exact opposite. The fact I rate him very highly on those two is basically the reason I need to rate him lower on the remaining one -- if he was top notch in all three, he should be much better ranked.
You can always say that the whole problem is that the guy does not practice and/or doesn't care. Again, as I said in other occasions I don't buy that for a second. The kid is clever, he controls the narrative. He built a persona on court and that gives him an edge most of the times. People take my oriented criticism of him as something else... well, it is their problem. For me, the good old "tennis talent", that ability to do whatever you want with a tennis ball in whole lot of different situations, is something that Kyrgios lacks (in the context of a top 100 player, obviously). But he has the "talent" to make it look like this is exactly his forte..."