Mota threw 194 innings the previous 4 seasons combined before throwing 201 those two seasons. Same thing with Proctor. 156 IP in '03-'04, 188 in '05-'06. Jim Brower is a journeyman who was not particularly good in his heavy use years and was 32 in 2005. Dotel had his best 3 years following his year of heaviest use, and got hurt at age 31. Villareal is the best example, but his minor league usage was such: 64 IP, 63, 141, 148, then 98 at the MLB level. And even beyond the examples, relievers gain and lose effectiveness all the time independent of injury. You can find similar fluctuations among healthy relievers if they didn't get thrown into trash heap after a poor season.