#2 Johny Hendricks
Johny Hendricks used to be a kingpin at 170lbs. He went 5 hard rounds with Georges St-Pierre and in many people's eyes won the fight. He knocked out Martin Kampmann and Jon Fitch with his vicious left hand, which used to be one of the best in the UFC.
Now, Hendricks is in decline and Conor McGregor has taken over ownership of the UFC's most lethal left.
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Hendricks, despite only being 5'9'', has difficulty making 170lbs and in his last two fights, he missed weight and didn't look like the man who beat Carlos Condit and went to war with Robbie Lawler.
Hendricks is still a star in the division, and power like his doesn't go away, so a fight with McGregor is an interesting one indeed. As mentioned before, McGregor can take a punch, but Hendricks has shown in the past that his power is different from most men.
Judging by his lastest performances however, McGregor would be able to use his quick feet to keep away from Hendricks left hand and deliver his own blows. In this match-up, McGregor is the faster, younger, more in form fighter, and if this fight were to happen, McGregor would be the man to back.