On SCtUS remand for plain error review -- although the deft didn't forfeit the challenge to the imposition of concurrent statutes, the acts were arguably dissimilar and irregular enough to avoid the statute's scope, and the temporal link is thin, ergo: no abuse of discretion in imposition or level of explanation of concurrent sentences.
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.