It 100% is. And I can prove it:
Speed:
On Saturday, 4.58 Richard Sherman ran down 4.28 JJ Nelson. That seems strange until you realize the difference in hundreths of a second are so completely negligible when you factor in that football is not played on a running track. If you run a sub 4.6, then you are fast enough to be a starting CB in the NFL.
Height:
This one drives me up the wall. Let me ask you, is every catch in the NFL a rebound? Meaning the WR had to climb the ladder? No. 99% of the time its a catch ranging between the knees and shoulders. Its doesnt matter if the WR is 6'6 Calvin Johnson, anywhere in that strike range, the CB can also reach the ball. Jason Verrett. Only 5'10. Arguably a top 6 CB in the NFL. Why? Because balls arent thrown 3 feet above his head. They are thrown into the WRs body where the CB can also reach all of them. The 1 out of 1,000 that are a jump ball? Fine. You win. But are we really looking at CBs for the 1% of catches, or 99% of catches? 5'10 is perfectly fine for a CB.
Now looking specifically at Desmond King, we're not sure what his numbers will be, but we can reasonable expect 5'11 and the 4.45 range. That is perfectly fine for an elite CB in the NFL. Because the bottom line is that its about technique and CB IQ. Desmond has loads of both.
As long as you reach a minimum bar for the physical measurements, then