I think you need to look at things a bit deeper than that though. Remember the ball carries differently in Miami than it does in other cities. Using a rough estimation (the number of field goals and TDs scored for and against with an additional kickoff added for and against at game start & halftime) it would appear the Dolphins have received roughly 56 kickoffs and had returns on 27 of those while the Dolphins have kicked off 55 times and had 29 returned. Those numbers make it look much closer than a hand picked stat.
There are differences between venues, sure, but even your numbers suggest that the Dolphins are somewhat below average in the touchback department (i.e. probably no better than 17th, whereas the full numbers say 22, which increases to 20 if you discount the two kickers without a lot of kicks).
That kind of below-average performance just isn't what should be expected from a high-powered young kicker. Inconsistency, sure, problems with precision on long kicks, sure, but not touchback performance. So when you COMBINE poor field goal kicking with too many short kickoffs, well, then I think it's cause for concern.
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