Looking at some of the top big receivers in the league like Calvin Johnson, Brandon Marshall, Vincent Jackson and Andre Johnson, all these guys are up around the 6-3 / 6-4 range 225-235 pounds and VERY effective as #1 receivers. (You can already see where I'm going with this right?)
What if we were to lineup Mark Clayton on the outside, Danny Amendola at the slot, Daniel Fells at tight end, Steven Jackson in the backfield and Fendi Onobun at 6-6 / 249 with his 4.49 speed as the other outside reciever to try and isolate him on a smaller cornerback or safety and see how he fares? I think it would be worth a shot. Imagine what adjustments the defense would have to make worrying about stopping Steven Jackson and possibly allowing either of the receivers to go one on one somewhere on the field at any given time? I don't know about you but I think it would be fun to watch.
I know he needs to work on his route running skills but sending him on a go route and throwing up a jump ball even if all it gets is a pass interference call would be an excellent test of his skills.