Is Musk the boss behind SHIB?
No, he's not CEO of Shiba Inu, Shiba Inu is a useless shitcoin where Elon Musk wouldnot care. Elon Musk is not CEO of a shitcoin.
I am optimistic that SHIB's performance is as good as DOGE 
I'm not optimistic because Shiba Inu is a shitcoin. Referring to your username, SHIBA INU should be interesting for you
It's true that Elon Musk never admitted to being the developer of Shiba Inu. He did not even admit that he invested in Shiba Inu, and even said that he did not have this coin at all. However, we cannot rule out such a possibility.