He's a terrific all-around athlete. My best guess is that LJH currently has everyone's attention, especially going against 5'9-5'10 DBs. So the idea is to give Epps every chance to move from TE to receiver. If the experiment works and it gives us some continuity in fielding multiple 6'5 slot receivers, then the question quickly became "but how will defenses counter?" Will they start playing CBs with Epp's size? Something like this is probably where this speculation started.
The Texans have a rookie named Jordan Thomas who is 6'5,270 (or 6'6, 280 depending on who you go by) who ran a forty in the 4.6s. He is playing well with 3 TDs. But in college at Miss St he never played TE, he was always a WR (I think bc their roster had lots of TEs but no WRs). But can you imagine being a typical 5'10 college corner lined up in man coverage opposite a guy that size who can run a 4.6? Yikes