I'm amazed about how many people here are ignorant about the utility and accuracy of a hand-timed pro day 40 versus a laser-timed combine 40. The most common conversion used is to add 0.1 seconds to the pro day 40. In past years, I've heard people add as much as 0.2 seconds.
Plus, 4.48 is likely a propaganda time by Arizona and his agent. Want evidence of this?
So if he had run at the combine with a laser-timed 40, you're probably talking about 4.6+ and some of you are using this pro day time as a reason to bump him up to 3rd on your list of draft prospects. Lol. Clueless.
This is exactly why he and his agent set it up this way. Decline to run at the combine, with a more accurate 40 time and an apples to apples comparison to your peers and then run a hand-timed 40 at your pro day which makes you look fast when you really still aren't fast and use a time that was faster than the scouts stopwatches and then use a high profile insider to broadcast that cherry-picked time.