If I were a VC (I am not) my concerns would be:

“Why is nobody working with this solo founder? Is it bcause they are difficult to work with, greedy, or unable to sell their vision to other people?”

Each of those make rocket ship growth less likely because big companies require teams. So convincing evidence would be success or an obvious different reason for solo status like just got out of prison.

I mean if you know a cofounder improves your chance of getting to the next level, but you are unwilling to do that, how likely is it you will get to the level beyond the next level?

But I am not a VC. Good luck.