RDA would beat the snot out of McGregor whether it be at 155, 170 or catch weight. I don't think its a good match-up even though McGregor might have some success in the first round as they go through the feeling out process. RDA is solid every where and his only real match-up problem is pressure fighters who are also strong wrestlers. That isn't McGregor at all. RDA fought the best at 155 and 170 and even went to decision against both Usman and Covington. The only way McTapper could win this fight is have the bout at 155 and RDA has trouble making weight (which happened in the past) and has stamina issues so that McGregor's lack of gas tank is less of an issue. I think RDA finishes McGregor in R1 or R2 if they fight anytime soon. My guess is that McGregor wants nothing to do with RDA as RDA doesn't hold the belt at 155 or 170 and he would most likely get his ass kicked in embarrassing fashion. McGregor will make stupid comments on Twitter, not fight any contenders and eventually jump the line to fight for the 155 belt without earning his shot. Probably fights a trilogy fight with Nate Diaz who isn't a top contender at 155 or 170, but he is a name fighter and someone McTapper might actually beat.