There are so many assumptions baked into these questions that it's a little hard to answer. First of all, I'm not a fan of the "10X engineer" framing. I'm much more interested in the systems that companies can build to create 10X teams.
I am thinking of two conventional "10X engineers" right now that I've worked with in my career. One is extremely loud, brash, judgmental and basically scary. If you are brave enough to come to him with a question, and he thinks it's stupid, you will basically never live it down. The second is extremely humble, quiet, and gentle. If you come to him with a question, he probably won't answer it but will show up two days later with a fully-implemented solution that he created at 2am just to see if it was possible.
In most companies, the first 10X engineer tends to get promoted to a position of seniority, while the second is generally allowed to quietly leave the company when they get bored. And don't even get me started on all the incredibly talented people out there who our biased hiring processes can't ever identify as "10X."
If you ever get the chance to mingle with some of the truly famous founders, ask yourself if they strike you as the smartest people you've ever met. Now, many of us get star-struck when we meet people who are rich and powerful, and we rationalize whatever garbage comes out of their mouths as genius utterances, because deep down we're all still primates. But if you can get past that, you'll notice that a lot of really successful founders (and investors for that matter) aren't especially bright or thoughtful. But they do have other critical character traits that helped them succeed. Here's a PG classic on the subject: http://www.paulgraham.com/bronze.html
He also has a great essay about the importance of grit and determination but I can't quite remember the title.