So I’ll let you in on a little secret, tight ends don’t have to be just “tight ends” anymore. The position has evolved so much with the proliferation of the spread, that tight ends, if athletic enough, can essentially play both traditional tight end AND wide receiver. Not every tight end can do this, and not every tight end is in an offense that does this a ton (see George Kittle for that), but some of the more spread oriented minds in the NFL and college have revolutionized the position. In general terms, the flex tight end expands the matchup difficulty presented by a tight end.