Thing is, when you're paying somebody, you don't need to accept their input on the game. He could have somebody just working on animations or something while he does gameplay or creating species or something. He doesn't have to give up any control or split the profit directly with anybody, there are plenty of ways to add more people without most the risks. It's not a guarantee that adding more people would hurt the project in any way, that's just on him and his possible inability to work well with others. You say adding more people could hurt the project, I'm saying it's as likely to improve it at the very least. Assuming +1 would immediately be worse than leaving the project just to him is sure an interesting take, especially with the way the game is being handled right now with him solo.
What has he done on his own that's so worthy of trust? Not completely abandoning the project yet? We sure have low standards for game devs on Patreon. I just personally have trouble trusting anybody who doesn't give me a reason to trust them, lol. I've never been able to find any kind of long term goals/timeline for this project. Dude talks real nice on his Patreon and stuff but it's all just fluff and vague assurances if there's not even a plan to back it up. I feel like a lot of people might just be filling in the gaps in information without whatever they want to believe could happen with the game. Reminds me of the people who review games as 5/5 here when the game is at like .01 in development based on its "potential". Yes, the game has "potential", every game does when you have no idea what the fuck the dev is planning to do with it.
Should be a damn requirement for patreon games to have a "What's planned in the next release" description. That or a full timeline of content addition plans. I'm not personally seeing any of this "Full transparancy, no bullshit" basically.