Damn, you guys are really giving Lucas Leite hell. Lol. The dude is a 4 time world champ, 2 times Gi and 2 times Nogi. Keenan was doing an amazing job handfighting the free hand, and that kimura control is so powerful that there wasn't much that leite could have done once Keenan got his leg-side leg through the space. Keenan waited a little bit and hand fought before getting his leg all the way in front of Leite's face so that Leite would have a harder time using the RNC defense.
The way Keenan attacked Leite also had to worry about his back, as it wasn't entirely clear that Keenan would choose to armbar, triangle, or attack the back. All 3 doors were open. I think it's more a testament to Keenan's offense than Leite's defense.