Kerensky was not a Bolshevik.
Kerensky was member of social revolutionary party (SRs) who were most bloodiest terrorists before revolution. Most known was Boris Savinkov. Lenin graduated the school where Kerensky’s father was director. They dominated Soviets in 1917 and CHeKa, so Bolsheviks did share power with them. In 1918 SRs tried to overthrow Bolsheviks but were defeated.