On May 21,2018, Judge Laurie Silverstein of the Delaware Bankruptcy Court issued an order and opinion holding that a post-confirmation complaint by a successor to a debtor was, at its heart, an objection to a proof of claim and denying a motion to dismiss the complaint or, in the alternative, to abstain from hearing or otherwise transfer the proceeding to a court in New York. See Penson Technologies LLC v. Schonfeld Group Holdings LLC, Adv. No. 16-51522(LSS).
A copy of the opinion can be found here.