Not really. I don't think it proves or disproves it.
You need co-founders for moral support as much as anything. Having your co-founder leave puts you in a bleak situation; it kills morale.
Coming to rely on a co-founder and then having him or her leave you is certainly a morale killer. Single founders don't have that problem.
What a single founder lacks in support, he or she has to make up in resilience if they're going to get very far ...
Not really. I don't think it proves or disproves it.
You need co-founders for moral support as much as anything. Having your co-founder leave puts you in a bleak situation; it kills morale.
Coming to rely on a co-founder and then having him or her leave you is certainly a morale killer. Single founders don't have that problem.
What a single founder lacks in support, he or she has to make up in resilience if they're going to get very far ...