Conclusion
Quarterback Ryan Tannehill does not have the most accurate deep ball in the league. His deep ball accuracy in his short career has been mediocre. The same can be said for a surprising number of the best quarterbacks in the league. Worse can be said of several accomplished quarterbacks, such as Super Bowl winner Joe Flacco.
Heading into the 2013 season, Tannehill's deep-ball accuracy (as measured by Pro Football Focus, cited above) was statistically among the best in the league. Those numbers have come down considerably as Tannehill attempts to gain chemistry with an unfamiliar player. At times, the coaching staff and play design have worked against the two players as they attempt to get on the same page.
However, film study shows that when you strip away extraneous noise such as "Hail Mary" plays, defensive penalties and plays severely influenced by pressure in the backfield, Tannehill is throwing catchable deep passes to Mike Wallace at an acceptable rate.
This should give Dolphins fans hope that, in the long run, the noise of a small sample pool will give way to longer-term results that reflect the film.