I started airplane ownership co-owning with a retired prof, salt of the earth, and WWII vet. Great guy. It was a "nose of the camel" deal: My wife would not have assented to my buying an airplane else. But then when my partner lost medical, and gave up trying to get it back, buying him out was the most natural thing in the world.
OK, I'm a prof. Quiz. Pick one:
A: partnering with even the ideal person and outstanding pilot.
B: 100% sole ownership.
My answer is B. I am way happier as sole owner. Any issue about the plane? __I__ decide. My plane dammit!