I think most of the research like these are pretty much useless. This is because they assume that the success of a startup has correlation with the founders/co-

I think most of the research like these are pretty much useless. This is because they assume that the success of a startup has correlation with the founders/co-founders - there well might be, but imo the biggest correlation with success is time. Some startups go bust when they are launched in an unfavourable climate - sometimes the tech is too raw, othertimes the market is just not ready. Move them a couple of years before or after and they take off. Lots of startups which take off, dont keep the momentum - market forces disrupt startups a lot more than the other way around. When a startup takes off, often for no fault of the founders/co-founders - it creates a strong incentive for the founders to keep aligned and work together. If a startup does not take off it creates a strong incentive for founders to NOT work together. Often when a startup takes off - or if it raises a big round from a huge VC it creates a strong signal for co-founders to get on board. Case in point is dropbox - they got accepted into YC and it allowed the founder to 'hire' a co-founder.