I too think King will end up as our main "speed" receiver. He's had glowing camp reviews while Underwood is proving why he hasn't been able to find a home in the NFL.
I think everyone is beginning to see why we completely dumped our WR corps and didn't bring in a big name FA. Coaches and Gettleman were seeing young, hungry guys in practice that they believed could play in the NFL.
Keep in mind that quite a bit of these young guys' reps haven't been with Cam. They are only going to do more when that man takes the helm.
How fast is King? I think the only reason Underwood is here is to stretch the field