The Gaggle (Casey, Grant, Garrido, Jacquez, Rijo, Sirotka): I don't know if any of these pitchers is in danger of drawing more than a vote or 2, but they were all very good. None won a Cy Young or did anything else particularly remarkable. As a group they were remarkable only in their ridiculous similarity. Look at these stats, especially the OBP:
IP Wins OBP ERA Weighted era
Casey 2709 186 305 3.43 + .26
Grant 2944 183 303 3.27 + 1.39
Garrido 2837 173 308 3.28 0
Jacquez 2724 185 301 3.32 +.58
Rijo 2760 178 305 3.45 +.28
Sirotka 3188 205 311 3.70 +1.87
HOF SP 3491 250 287 3.03 +1.32
OK, so what's "Weighted era"? I'm trying to provide 1 number that describes the effects of the various hitting eras we've seen (see http://mlbbhbd.blogspot.com/2015/10/major-leagues-scoring-eras-from-wild.html).
So I just arbitrarily assigned a number to each era that's like our -4 to + 4 ballpark ratings. I gave the Wild West (Seasons 1 and 2) a +4. The Mini Steroid (3-8) gets a +3. The Transition (9-13) gets a +1.5. And the Long Normal (14-29) gets a 0. Then I just averaged the seasons (quick and dirty I admit, so a season with 50 IP gets the same weight as a season of 250 IP).
The result is probably accurate but not precise. For purposes of evaluating the Gaggle, it means only Sirotka pitched, on average in a more pitcher-hostile time than the average HOF SP.
In any event, I'm not going to vote for any of the Gaggle.
2 Monster Relievers - Lance Woolf (RP, Seasons 1-19) and Hugh Taylor (RP, Seasons 7-24): Woolf was one of the most versatile (he was used as a closer, setup and long reliever - even started 2 games), durable (2600 IP and topped 200 in a season twice) and dominant (2.71 ERA, .285 OBP, .316 Slugging %) relievers of all time. He rolled up 154 wins and 362 while pitching in all 8 seasons of the Wild West and Mini Steroid Eras, and pitching in Colorado for his first 3 seasons.
Taylor was more of a short reliever but not always a pure closer and certainly not a low-innings RP (1435 IP and went over 100 IP in 5 seasons). Not as impacted by the steroid eras as Woolf, he spent his first 8 seasons in hitter-friendly Wrigley. His qualitatives - 2.65 ERA, .280 OBP, .317 Slugging% - are easily HOF quality. His 95 wins and 340 saves could have been higher had he been used more exclusively as a middle reliever or closer, but I think the versatility should help his candidacy.
Woolf and Taylor have been 2 of the best and most prolific RP's in league history - we should make them our first 2 RP's in the HOF.