A red flag? For what exactly? That he might be another after school special waiting to happen? What difference does it make to his football ability that he's reserved, introspective and perhaps a little gullible in matters of love??
They regularly pay murderers and criminals in the NFL if they avoid convictions and make tackles on the field. Kansas City had a player whose girlfriend was quite real and now no longer exists. You'd think they'd welcome more guys like Te'o. Fake girlfriends who disappear don't screw up your roster with homicide charges.
This fake bromance fiasco should mean nothing to the NFL.