This is an odd question, methinks. The second best receiver is Randle El. But the #2 will be Wilson. The beauty of Randle El's attack is that he slipped under the radar of Plax and Ward, who defenses concentrated on, and created mismatches against OLBs and subpar nickle backs. Since Wilson isn't exactly Plax-quality, Randle El will still be at #3 as to hope defenses will concentrate on the X and Z receiver routes. Not to mention, Wilson, while supporting somewhat erratic play, will still make a fine #2 in Pitt.
'Cause I'm Cow ... Boy ... for life.