Just having the good new ideas isn't really enough, though. You have to be really persistent about figuring out all the details and making them work. This is related to, but definitely not the same as, being fascinated/obsessed by the topic.
Of course Einstein had great ideas. But he also spent many years working out the consequences of, eg, his first ideas about the fixed speed of light in vacuum and its consequences in physics, initially during downtime at his patent office job. Nearly all of the impact of the theory is in that working-out.
Work ethic is super important. The ability to grind on your ideas. And I think having some extrovert nature really helps in getting your ideas out there.
I was Paul's definition of smart, w/o good ideas. I loved to learn things. But I didn't really have the work ethic to build new things. I feel like I've done fine in life, but had you asked my middle school and high school teachers -- and even university... I've probably underperformed.
In contrast my son is bright, but not the academic star I was. But he has crazy work ethic in ideas he cares about. I've really nurtured his work ethic and played down the "smart" academic angle. If wants to finish a personal project and not study for that French quiz -- I'm fine with that. He gets an A-/B+ for the year, rather than an A. So what. The passion he pours into his ideas though is great and I think will serve him better over the course of his life.
I do compliment it. But probably more than that I emphasize that things worth doing are often hard and hard things often take time. So I taught him that setting short term goals along the way to long-term goals will help him stay on track. So he's becoming really good at showing me various intermediate states to his work, and I'm really excited when I see it. Whether its a game that he's writing or a business that he's creating.
As a younger kid he loved Legos. I think that contributed. He'd just do progressively larger and larger sets. As a kid I never could do a large Lego set. I had them, but they all remained unfinished.
Of course Einstein had great ideas. But he also spent many years working out the consequences of, eg, his first ideas about the fixed speed of light in vacuum and its consequences in physics, initially during downtime at his patent office job. Nearly all of the impact of the theory is in that working-out.