What is the IOR for the informants, assuming they are on the same metric? How "different" are the findings across them? This alone shouldn't doom an otherwise strong paper. Is there one informant who may be more "trustworthy" than the others? You could just discuss the differences, etc.
Technically, I think you are misusing covariates unless this was a group they were randomized to (though pretty much everyone does it whether its appropriate or not), so I also think you are justified in dropping it and analyzing them separately and just discussing accordingly.