In the first fight:
Connor McGregor weighed in at 168 lbs
Given the opponent change, and the outcome of the fight, I expect that Connor will have a different physique and weigh in lighter for the second fight. 164 lbs max.
He intends to return to featherweight after this fight, so he will probably drop some of the mass that he put on for the expected Dos Anjos fight. McGregor also clearly thought that his power would suffice in the first fight, but now that he will try to finesse more, focusing more on his footwork, speed, and timing, additional mass will be unnecessary.
Connor McGregor weighed in at 168 lbs
Given the opponent change, and the outcome of the fight, I expect that Connor will have a different physique and weigh in lighter for the second fight. 164 lbs max.
He intends to return to featherweight after this fight, so he will probably drop some of the mass that he put on for the expected Dos Anjos fight. McGregor also clearly thought that his power would suffice in the first fight, but now that he will try to finesse more, focusing more on his footwork, speed, and timing, additional mass will be unnecessary.