Kirby is an upgrade over Richt. The guy had UGA in the NC game his second year. I am not sure if Kirby will get back to a NC game, but the odds are better with him at the helm than they were with Richt.
When you look at the results, he hasn't been as much of an upgrade on the field as you'd think.
Each of their first seasons were 8-win retooling years.
You're correct that Kirby played for a national title in his second year and that's something Richt never did. But go back and take a look at Richt's second season. Richt finished the 2002 season 11-1, then won the SECCG and was ranked #4 in the country. If a playoff existed then, Georgia likely would have been in it - I think it is totally reasonable to believe than a 12-1 SEC Champion would have been in a 4-team playoff in 2002. It's entirely possible Richt could have played for a national title in 2002 if the playoff existed; he would have to have won that semifinal game like Kirby did, but the point is that he would have had the opportunity to play for a title. Now take a look at Kirby. Kirby finished the 2017 season 11-1, then won the SECCG and was ranked #3. If the playoff
didn't exist, I think it is reasonable to assume Kirby would have been on the outside looking in of a #1 vs. #2 BCSNCG match up. He wouldn't have had the chance to play for a title, just like Richt didn't have a chance to in 2002.
In Richt's 3rd year, he played for the SEC again but lost. Kirby did the exact same thing.
In Richt's 4th year, he lost a midseason game at home as a big favorite against Tennessee, which threw a wrench in his path to win the East. He also went on lose to Auburn, putting any hopes of an East title to rest. Kirby lost a midseason game to South Carolina at home as a big favorite, also throwing a wrench in his path to an East title. Kirby's 2019 season is still being written, so we'll see, but there are multiple opportunities for him to slip up a second time (Florida, at Auburn, A&M) and suffer a very similar fate.
Thus far, Richt and Kirby contrast only in demeanor/persona on the field. Kirby is a much more intense, emotional, fiery guy than Richt was. I think some people take that as an indication Kirby has more of a killer instinct or something so he'll be more successful than Richt. I don't know. Their on-field performance through 4+ years is eerily similar, and I think a lot of Georgia fans know this but don't want to admit it.
The key with Kirby is that as time goes on, he simply cannot have the occasional 8 or 9 win season that Richt started to have in the second half of his tenure, and he can't go a number of years without going to Atlanta like Richt did (Richt went to Atlanta twice between 2006 and 2015). Those types of seasons are ultimately what Georgia fired him for, not because he failed to win a national title.