Apparently the last two elected Republicans serving at the same time was John J. Hoellen (47th Ward) (1947-75) and Jack I. Sperling (50th Ward) (1955-73). Hoellen was probably the most prominent Republican on the Council and the biggest anti-Daley member. He actually came close to exiting the Council in 1966 when he nearly beat Roman Pucinski in the 11th Congressional district (a seat formerly occupied by Republican Tim Sheehan, who had also run against Daley Pere for Mayor).
Other than Doherty, Ald. Bernard Stone, who succeeded Sperling in a special election in 1973 when Sperling was appointed a judge, served briefly as a Republican from 1987 to 1990, but that was largely in opposition due to Harold Washington, and he’s since gone back to the Democrats when he couldn’t win a higher office as a Republican.
Carl Segvich isn't the only decent non-combiner conservative in the Chicago Republican Party, though admittedly they're a rare species. Only about 1/3rd of the Chicago Republican committeeman are decent GOP loyalists, and probably half of them are moderate or center-right rater than solid conservatives. There are a couple of really good conservatives though, another example is committeeman Kevin White in the 38th Ward. He ran for Congress in the 5th District (Rostencowski/Blago/Emanuel's turf) as a conservative Republican, a couple years back.
Being from the southwest suburbs, the ward nearest to me is the 19th, and as you can see from the map, it voted AGAINST Emanuel for mayor. It's probably the most "conservative" ward on the south side, and has a small GOP presence, but that's not saying much since most of the wards near it are 95% RAT. Mostly its because it's old fashioned "Lipinski Democrats" with a lot of cops and firefighters in that ward, and weak RAT leadership since the Hynes family runs that ward and Dan Hynes barely carried it over Obama. Still, it tends to be "safe RAT" except it unusual circumstances like GOP landslides.
The sad thing is we probably could win some races in Crook County when the RAT opposition is divided, except the state GOP won't lift a finger to help most Cook County Republicans, and we massive RAT voter fraud, and we have so many damn combiners here in bed with the RATs. A perfect example was last November when the cook county assessor race has a combine RAT and non-combine RAT running against each other in November, and they split the loyal RAT voter base almost 50%-50%. We could have won that race with only 34% of the vote (I think our candidate got about 26%). But that would have required the GOP to run an extremely visible campaign county-wide and spend lots of money. It also would have required unified conservative support, and we had some tea parties and other groups endorsing the non-combine RAT because he was "honest". An honest liberal RAT is still a liberal RAT, and he did not share any of our beliefs.
Rutherford's numbers are interesting. He was the highest polling Republican in my suburban township, and it seems to be similar results in the rest of the Chicago area. Rutherford's been bad on a handful of issues, but overall is very conservative. The key here is not only did Rutherford vote reliably pro-life, pro-gun, anti-illegal, etc. in the state Senate, but he's been vocally supportive of these issues, such as sending out newsletters to home schoolers, being active at gun events, etc. But the combine was apparently focused on Brady and pulled out every stop to defeat him on election day, yet didn't view Rutherford as a threat (or didn't think the office he was running for -- state treasurer -- would have much impact), so they ignored him. As a result, we have another staunch social (and genuinely fiscal) conservative who handily won suburban Chicagoland, and even some Chicago wards within the city. I bet Rutherford also won Kirk's district. Of course, they will ignore the fact an outspoken pro-life and pro-gun candidate won places where "moderate" voters are supposedly scared to death of anyone who's to the right of Hillary Clinton.
I don't suppose Kirk's fan club will rethink their position that all politicians "have to" love NARAL to "win" the 10th, now that Brady and Rutherford carried it.