Gorico, I posted the numbers for both Smith and Olawale earlier in this thread that you can go back and look at. Olawale is head and shoulders better than Smith as a receiver and runner. Olawale also led his team in special teams tackles in multiple years.
I think you just liked what you saw in Smith and really don't know much about Olawale. Smith developed into a good run blocker and is a little better than Olawale in that area, but Olawale has him beat in practically everything else. This is an upgrade.