Just how fast is Rashid Shaheed ?

Yep.

Also to add to this, there is speed, but there is also “how fast are you with football gear on and with players on the field impeding you” speed. Not everyone carries their playing equipment the same nor plays the same when facing defenders.

Shaheed has a sudden-ness to his speed, incredible burst in and out of breaks. So while his long speed may not be as good as some of the players illustrated above, his catlike quickness makes his speed just as effective if not more effective for the standard 4 to 7 second NFL play.
Hit the nail on the head. We've seen track guys try to play football and they can't play a lick because it's not as simple as just running really fast.

Shaheed's greatest strength is his burst. He reaches top speed in the blink of an eye and he can maintain that speed during his route. Corners have absolutely no margin for error. If he gets behind you, it's over.