The player of the final day of Lions minicamp might have been TE Joseph Fauria. The tight end caught multiple touchdown passes in team drills and used his size well in the red zone. Some of the touchdowns were over undrafted free agents, but he needed to have a good camp and he did that.
Conversely, Eric Ebron had what seemed to be a rough indoctrination to the NFL. He struggled with dropped passes throughout OTAs and mandatory minicamp, including two drops on the final day of practice. Drops were an issue for him at North Carolina, so to see him continue this trend during his first few weeks as a professional should be at least a little bit concerning to the Lions. That said, it is still early and he is clearly still learning everything, so it could be an issue of just overthinking on routes and not letting instincts take over. This will be a situation worth monitoring during training camp.
Of the 21 tight ends who have been drafted in the first round in the last 10 years, 14 have managed to play at least 14 games. They averaged 35-371-2.6, or #31 TE numbers. (Oddly enough, that's where Brandon Pettigrew finished in 2013.) It usually takes a while for a young tight end to make a fantasy impact, though there has been the occasional exception. Jeremy Shockey (#3 TE in 2002), Heath Miller (#11 in 2005) and Dustin Keller (#14 in 2008) all posted TE1 or fringe-TE1 numbers as rookie first round picks. Cam Cleeland, Rob Gronkowski, Aaron Hernandez and John Carlson all had a TE1-type impact as rookies even though they weren't drafted in the first round. Ebron is an intriguing TE2-type in a potent offense, but he's no shoo-in to make a big fantasy impact in his first season, especially if he’s struggling to learn the offense.