It has been my experience that when something of this nature happens that if you are going to sue a company that has multiple dealings with other companies , or for that matter, dealings in the near past, you go after everyone. Lawyers will tell you it is the "shotgun" effect. Somebody's going to get hit and hopefully remedy a wrong, no matter how large or small the remedy will be it helps the injured party(of course after attorneys fees)
That doesn't make it right, it just makes it happen.

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