Joba Hurt?

I know the results were good tonight and the radar gun even lit up 95 a couple of times but this is still not the Joba we saw last year. Here are the pitch fx numbers;

Avg fastball Speed - 92.76
Max Speed - 96.3

Not bad numbers but compare that to last years starts;

Best Avg FB Speed - 95.51
Worst ang FB speed - 94.57
Total Avg FB as starter - 95.00

Best Max Speed - 99.6
Worst Max Speed - 97.8
Average Max Speed - 98.86

So where is the other 2 mph? Those 2 are what take him from a very good pitcher to a once in a generation talent. His average FB as a starter last year would put him second in the majors behind only Justin Verlander while his 2009 average only puts him in the top 20. So the question that needs answering is why the drop in velocity? Is he hurt? Is it poor mechanics? Whats the deal with Joba?