He ain't throw it because Usman circled off the center line away from the right every time he was in range and also because he was scared of getting slammed to the ground. Couldn't work him off the clinch because Usman is bigger, taller, and stronger, with longer limbs which meant better leverage and grip control.
Woodley has literally 2 ways of winning a fight; he backs into the fence to either explode with a right hand if guys like Till and Wonderboy drop their hands and stand in front of him or explode into a takedown on guys who can't reliably defend it. If the fighter doesn't present him a stationary target for his right hand and can predict/stuff his takedowns he straight up has zero offense, which is how Rory and Usman exploited and dominated him.