A relator under the Act can seek voluntary dismissal with prejudice for purely private interests without binding the non-intervening government side, whose interests in the claim are dismissed without prejudice.
Statute requiring written opinion and reason for decision presents two freestanding requirements which can be accomplished separately.
Relators' having shared counsel with second relator in another forum who intends to pursue the action does not establish bad faith.
http://www.ca5.uscourts.gov/opinions/pub/17/17-20389-CV0.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.