According to Saints Director of Sports Science, Alvin Kamara's acceleration is....

Kamara's movements are so smooth and natural that people don't realize how fast he is moving unless they look at the yardage markers going by.

Yup, he is lightning quick which is wwwwaaaayyyyyyy more important than 40 time.....he is not your typical NFL back, I think he has the potential to play well into his 30's.....if the Saints OL and run schemes improve the AK is declining talk with vanish pretty quickly IMO....