In my opinion Kevin Smith (pre-injury) was most certainly the equal to Deion in every area except self promotion. Tearing a achilles tendon for a player who relies on speed is a career killer, I felt so sorry for Kevin because I felt he was as good as any CB playing at that time.
I will always respect and have a soft spot in my heart for Kevin Smith he always had class and never whined even after his injury. After his injury he had to rely on his instincts more and his tactic of choice was to deny the reciever his preferred route by positioning himself so the receiver had to run around or through him. In my opinion that should be considered a legal tactic but The NFL decided it was slowing the receivers chances at the catch. Thereby eliminating Kevin only real skill left his ability to get in the recievers way through intuition.
Kevin Smith's career before his injury was short but even playing on one leg he managed a decent career, one can only speculate as to how good he could have been, but IMO he was as good as anyone before he was injured.