The tight end position is very fluid with the Patriots currently from the bottom of the depth chart to the very top. 

Of course, we know by now that Rob Gronkowski is still mulling retirement, but reportedly is "pretty certain" he'll return in 2018. That said, the 28-year-old clearly still has some issues to resolve with head coach Bill Belichick. According to Jeff Darlington of ESPN, Gronk and Belichick aren't exactly seeing eye-to-eye at the moment. 

"We're talking about frustrations on both side of the aisle here," Darlington said on ESPN over the weekend. "For Gronkowski, he's just physically and mentally spent and doesn't feel much has changed this offseason to make him think it's going to be any different this coming year." 

He added: "Belichick is a little bit frustrated because he feels like Gronkowski is not 'all in,' which is obviously a critical component to his blueprint. He has cited things to people close to him as nuanced as an Instagram post that Gronkowski posted about Danny Amendola signing with the Miami Dolphins under which he said 'be free, be happy.' That didn't exactly make Belichick very happy. He was reading the underlying message there. He wants to know Gronkowski is all in." 

That bubbling feud along with the release and retirement of Martellus Bennett, the lackluster first season in New England for Dwayne Allen and the unknown surrounding second year man Jacob Hollister, the Patriots may want to look at adding some more youth and depth at the position. 

One NFL Draft hopeful who was able to strut his stuff in front of Director of Player Personnel Nick Caserio was intriguing tight end prospect Deon Yelder. According to Tony Pauline of DraftAnalyst.com, Caserio was on hand for Yelder's Pro Day at Western Kentucky last week where the 6-foot-4, 255 pounder was said to have performed well. He recorded a 33.5 inch vertical, a 10 foot broad jump, an was clocked at a 4.72 second 40-yard dash. 

He was also said to have run crisp routes and caught the ball well. 

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During his senior season at Western Kentucky, Yelder played in 12 games while catching 52 passes for 688 yards and seven touchdowns. He also rushed twice for 15 yards and a touchdown. Yelder was invited to the Senior Bowl and was able to make the most of his opportunity finding the end zone on a pass from Richmond's Kyle Lauletta. 

Yelder in undoubtably a project at the tight end spot after he resumed playing high school ball as late as his junior year. Because of his lack of prior history, Yelder wasn't really recruited whatsoever. In a fabulous piece written by Yahoo Sports' Eric Adelson that highlights Yeldon's hard upbringing in Louisville, he was a offered a preferred walk-on spot by former Western Kentucky offensive coordinator and current Purdue head coach Jeff Brohm. 

“If you get guys that come from that background, they really know what hard work is, and what it’s going to take,” Brohm told Yahoo Sports. “I felt like he had it in him. When things didn’t go his way, he worked through it. I felt like if we could get him to stick it out, he had the talent to grow into an athletic tight end.”

While he likely won't immediately burst onto the scene during his rookie year in the NFL, Yelder's shown that he's coachable and has the ability to be an solid developmental piece in the right NFL system. Currently, he's looked at as Day 3 draft choice.