Conor McGregor won UFC titles at 145, 155, and aims to do the same at 170. His last fight, a devastating win over Donald Cerrone, was held at welterweight; The Notorious had to eat up 170, a far cry from the sepulchral scene that was his later featherweight weigh-ins.
"I look at all my clients as human beings and I've seen him at 145, 155 and 170 in mixed martial arts and he just appears to be a lot happier at 170," said Attar. "It's not as strenuous on the body as it relates to the weight cut. That does not mean he wouldn't be able to make 155. 145, I just think it's unhealthy. ... But 155 is doable and something I know he's keen on doing again so that's not out of the realm of possibility."
UFC president Dana White says McGregor will probably next fight the winner of Khabib Nurmagomedov and Tony Ferguson at UFC 249 on 4/18. However, the Muslim holy month of Ramadan, a time of fasting, prayer, reflection, and community - and not fighting - lasts from Apr 23 to May 23, so a rematch vs. Nurmagomedov would push far out into 2020. In the meantime, McGregor might take another fight at welterweight.
"I think that particularly if you're able to keep your strength or improve your strength and your muscle mass, and more importantly be able to carry your weight to keep your speed and quickness and explosiveness, well then why not?" said Attar. "Gaining a competitive advantage is not always having a size, height, speed advantage but also having the right mindset and the right energy come the night of competition. It's really a subjective thing and you've got to leave it to each athlete to decide what's best for them."