Chad has no proof of this "injured foot". McGregor actually has proof of his knee injury though and Rogan already talked about it on his podcast and said that even the bookies knew. There are also pics of him 'preparing' in the physical therapist's room. You're also wrong about this 5 days shit, Mendes had been training for 5 WEEKS. His normal camps are short and only 6 weeks. That's a whole 1 week difference.
Go rewatch the fight or check the stats. RDA was getting tagged plenty and against McGregor he can't afford it. He isn't going to out pressure arguably THE best pressure fighter in the sport (along with Weidman). RDA is still very much a brawler with some refinements made. His grappling is great if he can get it to the ground, but he's no NCAA wrestler runner-up and 2x All American that happens to be one of the best wrestlers in MMA. He's also not nearly as explosive as Mendes is. Conor has knocked out many Lightweights. You think that just because RDA fights in the UFC that makes his chin different? Conor just knocked out Chad Mendes when most of you guys laughed at that. His left hand is the most dangerous in MMA history. So yeah, I do believe he could knock RDA out. Call that "reaching" but he's already had no problems knocking out 155ers cold (Buchinger for example).