I haven't read Outliers, Flow or the Talent Code yet. But I have read Talent is Overrated.
What I got from that book is that talent doesn't really mean anything. Without deliberate practice you'll never outperform. It doesn't matter what you're born with, it's how many thousands of hours of deliberate practice that determines how well you'll do at something.
Examples typically used that born talent matters most - Tiger Woods and Mozart, are discussed in the book. Both Tiger Woods and Mozart had dads that were very interested in a particular profession and wanted to teach their kids that profession at a very young age. Woods' dad would hit golf balls in front of him while he was in a baby carrier, and Mozart's dad was a musician and music teacher. By the time they were in their early 20s, they had the same level of experience (deliberate practice hours) as most people in their 30s and 40s. They just got started sooner. Not only that, but neither Woods nor Mozart did anything remarkable until their 20s. Though they did things other people couldn't do at age 13, they were not world beaters until they had the roughly 8-10k deliberate practice hours under their belt.
Obviously, when we're talking about professions that require certain body types, what you are born with makes a difference. I could never be a left tackle in the NFL, just not built for it. But for anything else, you don't really have much of an excuse for not excelling at something.
The key is deliberate practice. This is not the same as practice. Deliberate practice is a designed practice that works on your specific needs. It's not enough to spend 3 hours a day on the driving range, wacking golf balls around. Deliberate practice would be something like:
1) Golf coach tells me I need to change my stance
2) My new stance feels weird, but it's the correct one
3) I'm gonna hit 100 balls a day, in a row, using the correct stance and staying focused until it feels normal and I can do it in my sleep
4) Then move on to the next thing I need to work on
It's determining what you need to do, beforehand, and then repeating that thing, whatever it is, over and over again until you've perfected it. Deliberate practice should be mentally exhausting, you should not be able to do it more than an hour or two at a time. It should be hard, and it should not be fun. You should not expect to enjoy it. But you can enjoy the results of it afterwards.