Please see excerpt from May 4, 2016 ADN  article: "At the NTSB, Williams declined to say whether the bird strike affected control of the Cessna during the deadly flighty, noting that the investigation is still in its infancy." 
Maybe we can let the NTSB do the investigating and we can be a voice of support to the family and friends of those who died. That is something we are all qualified to do.