The guys that actually founded Tesla already knew Musk as rocket man.
Lots of people knew who Musk was, they didn't found "Tesla" they founded "SRA", the name Tesla was the one Elon gave it, it didn't have a product, didn't have IP... they and Elon both wanted to start an EV company so they teamed up.
You'd have an argument if there was already some product but there wasn't, the only argument you have is that a company (with no product and no IP) had been registered.
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