We point you directly to the experts: Our good friends at MMAJunkie.com are reporting that former Marine Brian Stann has been scratched from his upcoming middleweight bout against Hector Lombard, which was to be a five-round main event for the Aug. 4 UFC on Fox 4 card in Los Angeles. MMAJunkie did not report the nature of the injury. Ariel Helwani, a well-known MMA journalist and frequent TV interviewer/host/personality, reports at MMAFighting.com that Stann suffered a shoulder injury that will not require surgery, but could keep him out of the octagon for up to eight weeks. There has been no…