Your view is fine, but it's irrelevant to the legal realities.  Your view is a reflection of how you believe things should be in the world of toy businesses.

I doubt that anyone is going to sue the "shareholders" of BitcoinGlobal.  In the "real" world, if they did then it would be up to whichever shareholders ending up paying out the judgement/settlement to try to recover funds from Nefario and/or the other shareholders.

I doubt that anyone is going to sue usagi, either, even though he's improperly using what should be secured assets for personal advantage.  In respect of usagi's ventures, it seems much more clear cut that his shareholders are not partners and that he's essentially operating as a sole trader (which would make him the only one legally responsible for any debts).