I think Thomas's 40 time was 4.7 (I'm channeling a comment by Silverstein), so he is more like a small linebacker than a big safety. If Thomas were faster, I bet he would not have been available on a practice squad. He is just fast enough, and maybe he "plays fast". Was Richardson faster? I 'spect so.
That could be, but then he is quickest with his first couple of steps, because he moves around like no other LB except Matthews. And he has covered RBs in wheel routes better than Palmer, who was doing OK.
Bud Adams told me the franchise he admired the most was the Kansas City Chiefs. Then he asked for more hookers and blow.