I'm guessing that lone developer projects have a higher variance as they are a direct reflection of the skill of the single developer. Team projects trend to th

I'm guessing that lone developer projects have a higher variance as they are a direct reflection of the skill of the single developer. Team projects trend to the average. If you have a very good developer doing a lone project it's probably going to be good. Because they have full control. But I doubt an unskilled developer will have a very good lone project. You want them on a team environment for the structure and mentorship. Finally, it's worth mixing your developers as their combined effort is worth more in the macro level rather than the micro level.