I thought the kung fu guy gave a good accounting of himself especially as a non grappler vs one of the best in the world.
Looking at that vid I cant see how a sprawl would've worked, the grappler came in too high. Avoiding being taken down can be done purely with close striking methods, primarily because close striking should include an element of controling manipulation, but the fact remains it can be done, it is just hard and like any method not completely reliable.
Hell, looking at the vid if there had been no wall the kungfu man may yet have escaped that particular attempt, or if he had just avoided trying to kick above the waist a second time as gracie was coming in.
It's Shotokan not Shoto-can't!!!