An entrepreneur is someone able to start a company and in a company, you need more than an engineer to build a device, you also need a guy to sale theses devices, a guy to market it and a guy that able to get the capital and do the balance sheet.
Usually finance can be done with time or a mortgage, so we ignore that one pretty often but if you can only build, well if you don't learn the other skills or never find someone to fill theses skills for you, then you can't really start a company, can you?
In the eyes of their lifetimes and most of history, Edison won the Tesla v Edison battle nearly 100%. Edison was a vastly better salesperson.
If you ask the average person who Nikola Tesla was today, they'd probably say something about the car company. Elon Musk sells the name Tesla better than Tesla himself ever did.
If your idea of success is obtaining money or changing hearts and minds, you better learn how to sell (or I guess you could devise a spectacularly dangerous weapon).
For instance, Tesla's ideas were used extensively by others to make money. Is the fact that he personally didn't capture that revenue with is own account take away from his "entrepreneurialness" score?