I think that those qualities trump physical skill, but only when you have reached a certain threshold of ability. You can have all of those skills, but if you simply can't throw the football or you are too small or any one of a million other things you won't be an NFL QB. Tebow can have all of the characteristics of Dak, but he has horrible accuracy - he doesn't meet the minimum requirement regarding throwing ability. So he'll never be a QB.
Meanwhile you can have a guy like Jeff George, who had an all-time great arm and lacked all of the other characteristics. The difference is that if you have an all-time great arm you are a lot more likely to keep getting jobs in the NFL because the coaches think they can teach you the other aspects - leadership, anticipation, read progressions. For the most part they are wrong, because those things are as a part of a person as the ability to throw a football 70 yards. They can be improved, but not so dramatically that a guy like George would ever be a franchise QB.
I also believe that preseason games are perfect for sorting out who does and does not have the physical or mental skillset necessary. Because if you can't throw in preseason you just can't throw. If you can't make the simple reads required when facing a vanilla defense you are going to feel like a person who can't swim dropped into the ocean when DCs start scheming for you. Dak can throw, he can make the simple reads, he has shown a good feel for when to run.
We have heard about the intangibles, we now have some evidence of the physical/mental skillset transferring to the NFL level. Now comes the hard part. We'll have to wait and see how he develops, but he has at least met the minimum criteria and passed his first two tests with flying colors.