As there is no realistically probable scenario in which Hobbs Act robbery could be accomplished without the use or threatened use of force, the offense is a valid predicate.
Harmless error on not revisiting sentence after revision to guidelines during pendency of appeal; original sentencing court understood its discretion to have terms run concurrently or in sequence.
http://media.ca1.uscourts.gov/pdf.opinions/16-1405P-01A.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.