FOXBORO --- New England Patriots fullback Reggie Gilliam thinks his offensive talent hasn't been used enough in the NFL. The former undrafted free agent out of Toledo spent six seasons with the Buffalo BIlls, but he only touched the ball 24 times on offense. Mainly used as a special teams contributor, Gilliam thinks he can become a valuable asset for an offense. That's why he signed with the Patriots in free agency back in March, who's had a long and successful past of using their fullbacks to the highest possible level. Gilliam believes that playing in New England can unlock a different part of his game he hasn't used much. "I feel like I’ve been underutilized before, and I feel like a lot of people don’t know what I can do with the ball in my hand because it hasn’t been displayed," Gilliam told reporters after voluntary offseason workouts this week.…