This is especially true to the company wants to make an example of you "pour encourager les autres." If the risk is worth it then I would second the recommenda

This is especially true to the company wants to make an example of you "pour encourager les autres." If the risk is worth it then I would second the recommendations made by others to minimize the online (and offline) links between all of the co-founders for as long as possible. Wait as long as possible to incorporate, etc. While it sounds a bit "sneaky" you can also engage a confederate or two to call the boss asking for job references on these co-founders to make it seem like they are actively engaged in seeking other jobs; a casual coffee at the office next month with old co-workers and a well-placed "So what is <insert name here> up to? Do you know if he found anything?" could even lead to your old boss thinking that he set them up as your co-founders :)