By Tzvi Machlin Kirk Herbstreit has had a pretty busy last couple of days between his Thursday Night Football and College GameDay duties. But he started this Sunday as he often does: With an updated ranking. On Sunday, Herbstreit revealed his new top six rankings following Week 3 of the college football season. There weren’t many changes from last week though. Two SEC and two Big Ten teams made up his first two and latter two respectively. He had Georgia at No. 1, followed by Alabama, then Ohio State and finally Michigan. Those picks are pretty in line with what the Associated Press had in its…