For some reasons, the NFL Combine is insignificant. Scouts know "generally" how fast prospects are and how strong they can be.
Scouts have a "range" in mind where they expect to see the prospects run in. If they go above that range in running drills or below it in lifting and jumping drills, red flags are raised and stock might drop.
However, if a prospect outperforms the expectations by a notable amount, that's when players really start to rise.
Dubbed as "Workout Warriors" since Mike Mamula wowed scouts at the 1995 NFL Combine, these prospects rose dramatically because of the Combine and have gotten a much bigger pay day thanks to their athletic attributes.