He's never been a leg kicker (or body kicker) or a combination striker. He relies on one punch.
Also, the only time he's used leg kicks - against nate - he walked out on crutches.
This just aint so. This is a canard just like the myth that Conor has no cardio and a terrible ground game.
He has shown tremendous combinations, like in the Brimage fight, Holloway fight, Buchinger fight, both Nate fights, a host of earlier fights, had a hellbow finish vs O'Keefe, excellent striking from his guard versus Mendes and showed a very effective jab in his boxing match vs Mayweather when he needed it. He has shown very competent grappling in the Holloway fight, Diaz 1 fight w/ his esoteric Ashi Garami sweep, sub over Dave Hill, smooth full mount take vs Siver and TDD/clinch work in other fights. Conor uses what he needs when he needs it, he has a very high fight IQ (tho not given credit) and this is precisely why he introduced the very effective leg kicks to the Diaz fight, the teep kicks to the Chad fight, a near wheel kick KO vs Brandao, using capoeira kicks to move opponents in to his finishing shot, so you really can't say 'he only has a left' when he has shown he has more, and you can't blame him for knocking out guys like Aldo in one punch.
He has proven he is a complete martial artist & this canard that he is one trick pony, the Bob Sapp of featherweight/lightweight, simply did not appear until he started KO'ing everyone in seconds. If you have been around long enough, you'd know that Conor was considered the heir to GSP when he was on the rise, a total and complete mixed martial artist that was pushing the game forward, and this is largely how Jack Slack became so popular by breaking down what Conor was doing. Since the Diaz 1 fight he has become much more 'efficient' and focused on the areas where he has extreme potency, and one single loss versus Khabib after a long layoff does not change the facts, nor does Jake Shields getting subbed by Paul Harris mean he has poor BJJ or Cain gassing vs Doom mean he has poor cardio.