It's been a bit, but when doing game jams I shuffled working alone and working as a team. It seems duos are the best options for me, but solo is okay. It's just solo I get a little bit bogged down into doing the art and making it look nice instead of letting things be ugly first. If I'm working with an artist, things seem to go smoother because I can work on programming. 3 - 4 people on a very small game is too much, but obviously this is just jams and not something larger.
Yeah! They don't have to compete, they can all have their little different ways of doing things. Should probably crosspost more, I will try and do that when I can.