Davis's time would've been the fourth fastest at the combine. He's fast, but he ain't that fast. I don't believe that one for a second. Probably more likely he ran in the high 4.3 low 4.4 range.
I also have a very hard time believing Tautu's and Algie's times. Tautu would've been second fastest at the combine for true linebackers behind only Duke Riley from LSU.