Eagles beat writer Sheil Kapadia on the state of the team's tight end corps:
Brent Celek played 69 percent of the snaps last year and finished with 32 catches for 340 yards and a touchdown. Celek was very good as a run blocker, and it's no secret that Chip Kelly thinks the world of him.
Zach Ertz is one of the best receiving options on the team, having finished with 58 grabs for 702 yards. The feeling here is that he was underutilized (50 percent of the snaps) in 2014.
Celek is 30 years old and certainly does not provide the same threat as a receiver that he once did. But it's impossible to overstate how much Kelly loves him. This is still a run-based offense, and Celek is the best blocking tight end on the roster. He carries a $5 million cap hit, which doesn't seem unreasonable. In other words, I don't think he's going anywhere.
Many (including yours truly) thought Ertz would take a bigger chunk out of Celek's snaps last year. Ertz will have to continue to improve his run blocking to earn Kelly's trust. But his role should continue to expand in his third season.
Ertz's run blocking improved dramatically this year, per the grading of the analytics sites. Still, Kapadia's comments about Kelly's affection for Celek do not indicate that the team is ready to give Ertz significantly more playing time. Ertz finished as the #13 TE in standard formats even though he played just 50 percent of his team's snaps.