FRCP,
Res judicata effects of partial judgment below made the partial judgment sufficiently final for appeal.
A litigation-specific provision for a subset of parties in a release of claims against a larger group means that litigation-related claims against those not in the subset are not barred as a matter of law.
http://media.ca8.uscourts.gov/opndir/16/01/143758P.pdf
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.