I'm not endorcing the SPARQ rating. But, the linked source is an interesting read w/charts on Seahawk Tight Ends.
Link >>> http://www.fieldgulls.com/seahawks-analysis/2013/6/19/4445838/seahawks-pete-carroll-sparq-luke-willson
McGrath ran the short shuttle in 4.16 seconds, an elite number for a tight end of 250+ pounds (would have been first among all tight ends in 2013 and 3rd in 2012), which shows a nice lateral explosiveness factor, and he registered a 35.5" vert, another good number. His three-cone time, which isn't included in the SPARQ, was an impressive 6.99 seconds. A sub-7.0 3-cone would have been 2nd best in 2013 at the Combine, among TEs, and would have been top-4 in 2012, his draft year.
Helfet's athleticism numbers are also very good (see a pattern yet? You should be) - he ran the 40 in 4.71 seconds and the short shuttle in 4.22 seconds at 6'3, 240 pounds. His 6.84 3-cone is absurdly fast, and is buoyed by his very respectable 24 reps on bench.