Someone in there may very well know something. It depends on what type of information you are looking for, and if you can convince them to trust you enough to part with it. His advice may be more helpful than you think it to be initially.
If you are looking for an exact deliniation on the map of a no-go line, one honestly doesn't exist. Borders outside many of the cities aren't clear in this part of the world.
Since I really don't know what information you guys are looking for, I'm not sure if you will be able to find it here or not. What are you trying to learn from these people?
Between the 3 of you there, you do have a few inroads I can potentially see, and maybe a few I don't, but what you want to do is entirely up to you. Everyone in the place honestly knows something; it is up to you who and how you choose to approach them. EDIT: Also, nearly unconscious may have been the wrong way to describe the man drinking alone. His actions are slowed and he is obviously quite drunk, but he is awake, just a long long way from sober.
What you know to this point: roughly where you are going, roughly where may have issues with running into the Maasai, how they are likely to react to anyone that isn't them (hostile), what types of wild creatures may exist in the area, and enough information to form a capable list of supplies you want to bring along.