Whatever makes your genes more likely to spread goes into the definition of “fit” in this context.
Evolution doesn’t care how you managed to spread your genes. It only cares if you did it or not.
If you have great social skills, which ends up in you working together, which ends up in you being better than if you didn’t work together, which ends up in you spreading your genes, that counts towards your fitness.
Whatever makes your genes more likely to spread goes into the definition of “fit” in this context.
Evolution doesn’t care how you managed to spread your genes. It only cares if you did it or not.
If you have great social skills, which ends up in you working together, which ends up in you being better than if you didn’t work together, which ends up in you spreading your genes, that counts towards your fitness.
That’s pretty much what I was saying, but I got down-voted. 😅