I'm not sure you can make a direct correlation between his mechanics and the following but I'll bet some have tried.
This is Fernando Rodney's History of injuries since being called up from Toledo in 2004:
Jun 16, 2008: Missed 69 games (right shoulder tendinitis).
Mar 30, 2008: Right shoulder tendinitis, 15-day DL.
Aug 4, 2007: Missed 33 games (forearm injury).
Jun 26, 2007: Forearm injury, 15-day DL.
Jun 4, 2007: Missed 10 games (right shoulder tendinitis).
May 26, 2007: Right shoulder tendinitis, 15-day DL.
May 24, 2007: Right shoulder tendinitis, day-to-day.
Apr 24, 2007: Missed 2 games (neck injury).
Apr 22, 2007: Neck injury, day-to-day.
Jan 19, 2007: Re-signed by the Detroit Tigers to a two-year contract extension.
Jan 16, 2007: Re-signed by the Detroit Tigers to a one-year contract.
Feb 20, 2006: Re-signed by the Detroit Tigers to a one-year contract.
Jun 9, 2005: Missed 57 games (right shoulder inflammation).
Mar 29, 2005: Right shoulder inflammation, 15-day DL.
Jan 31, 2005: Re-signed by the Detroit Tigers to a one-year contract.
Nov 19, 2004: Activated from 15-day DL (tricep injury).
Oct 4, 2004: Missed entire 2004 season (tricep injury).
Apr 2, 2004: Tricep injury, 15-day DL.
Feb 5, 2004: Re-signed by the Detroit Tigers to a one-year contract.
Stats In ERA W L GP GS CG ShO SV IP H R ER HR BB K
2002 Erie AA 1.33 1 0 21 0 0 0 11 20.1 14 4 3 0 5 18
I put these stats up to show what he is capable of. He gets right handers out as long as he stays ahead in the count. He throws the crap out of the ball but one might argue the stress he puts on his body makes him break down alot. When evaluating pitchers one of the parameters that cannot be determined by the radar gun is DURABILITY. There are others....movement, make-up, background, temperment and genetics. But durability is the million dollar question. On the financial balance sheet I think Rodney is skating on thin ice.
Rodney is currently on the 40 man roster but at 5' 11" , 210 lbs. he is the shortest in stature amongst the pitchers except for Macay McBride (same size) a recent aquisition from the Atlanta Braves. McBride was drafted by the Atlanta Braves in the 1st round (22nd overall) in 2001. He did not pan out quite as they liked. He is a left hand hitter specialist, lacking command and easily hittable by right handers. Kind of a swing and a miss whiff by Atlanta for a first round pick.