I would say these players are less athletic and less versatile than New England standards. Deiter is not a poor athlete but he's weaker than typical for a third round pick. Certainly less athletic than the Patriots guards Mason and Thuney.
Calhoun actually tested better than I expected. He looks like a box brawler type most of the time. In the rare occasions he got out in space at Mississippi State he was more agile than I realized. But I was still surprised at some of the test scores.
The Dolphins in recent years have relied too much on subjective scouting and consequently have fallen behind the league as a whole in terms of athletic ability. It stands out no matter which evaluation I've looked at. Along with persistence with Tannehill, there was no reason to have high expectations when so many poor foundational decisions were being made. This was the first year in which the draft contained good athletes pretty much across the board. Even guys who look stiff like Prince had competent numbers for their position.
Ironically, if we had drafted Preston Williams instead of picking him up as free agent, then our average RAS number would have plummeted. That strangely awful combine day equated to a dreadful 2.76 RAS score for Williams.
I have no idea how anyone can be surprised that a troubled wide receiver with a 2.76 RAS went undrafted. However, he was an elite 5 star prized recruit so there was concealed talent. We'll see if he's sudden enough and plucky enough. Those are always the variables with bigger receivers.
Here are some links regarding RAS (Relative Athletic Score) and the Dolphins. You'll note how far we have lagged the league. The first one is average RAS on the starting offensive line from 2016. We were 4th from bottom. The second link looks at the 2017 draft in terms of RAS, with a notation regarding the 2016 draft. Miami was #31 among 32 in average RAS from the 2017 draft. In 2016 we were 25th.
The third link is an overall evaluation of athletic ability in regard to draft position. It is clear cut that the superior athletes are drafted early and then there is a tiered steady decline until the 5th round. However, it levels out in the 5th through 7th round. Perhaps that is why the Dolphins have had comparative success in those late rounds beginning with the 5th.
The Dolphins ignore or improperly evaluate athletic ability early. Dion Jordan scored well overall but flunked the key metric tests for his position, the ones spotlighted by other models like Waldo and SackSeer. Charles Harris was a flat out athletic reject. But once not as many top athletes are available and it becomes more of a grab bag situation, the Dolphins fare well:
https://www.prideofdetroit.com/2016/5/10/11634906/athleticism-and-offensive-line-success
https://relativeathleticscores.com/...17-draft-class-using-ras-all-32-teams-ranked/
https://relativeathleticscores.com/2017/04/23/does-general-athleticism-lead-to-high-draft-selection/
I'll throw in a 4th and 5th link...the 2019 draft class in total. Note than Michael Deiter was 5.64. That's not awful but consider the 9.84 for Joe Thuney and 9.17 for Shaq Mason.
The final link is a clickable RAS list of every draft dating to 1987:
https://relativeathleticscores.com/2019/03/15/2019-draft-class-ras-relative-athletic-scores/
https://relativeathleticscores.com/ras-by-draft-class/
BTW, there are outliers when weaker athletes over perform and superior athletes flop. We realize that. This is a tool. More often than not. When you are scrambling for outliers you are boosting the other guy's argument, not your own.