As governing circuit precedent on the question is in conflict with earlier circuit precedent that it doesn't distinguish or overrule, the earlier precedent governs -- voluntary dismissal without prejudice is therefore a sufficiently final order for the purposes of appeal, since it removed the case from the court's consideration.
Interlocutory denial of motion to reconsider by the courts of another circuit that eventuates in a voluntary dismissal with prejudice within the circuit is considered only in the context of the appeal from the voluntary dismissal; the implied challenge to the other circuit's courts does not make the subsequent decisions within the circuit unreviewable.
Appellant is sufficiently adverse for purposes of standing to final decision below. Although it resulted from appellant's motion for voluntary dismissal without prejudice, the decision contained merged elements of earlier adverse interlocutory decisions.
No abuse of discretion in denying motion to shift governing law to Admiralty when made in motion to reconsider.