I just want to post this question as I bet there are many of you out there that would research into this and if we can get a lot of people on this maybe we can find out a more accurate measurement between the three.
I have found that Miles Austin recorded a 4.47 as posted on his NFL Draft Profile. However, It is rumored that he ran a 4.29 at his pro day @ Rutgers (monmouth doesn't host a pro day). nfldraftscout.com is my most trusted source and it has him at a 4.47 time as his fastest (I don't believe they record as an average, they do they fastest time recorded from combine and pro day). Wikipedia is the source for the 4.29 time but anyone who knows about wikipedia knows that anyone can post anything and change the info. No source was cited hence my skepticism on that time. This however may be irrelevant because this was 4 years ago and we all know that a player can improve his 40 (though not by a whole lot by what I'm told). Maybe someone can find a more recent 40-time during his NFL tenure?
Kevin Ogletree is listed as running a 4.46 at the NFL Combine but NFLdraftscout.com has him listed at a 4.36 most likely at his pro day. I know that he is really fast and more sources than just CBS (nfldraftscout) has him listed @ 4.36 40-time.
Titus Ryan is a little harder to find as he just came out of the CFL so not as much information on him. He is a champion sprinter high school and college in the 100 and 200 meters. The only 40-time I have been able to find from him would make him the fastest player in the NFL with a 4.18 40-time. I have a hard time believing that because of how hard it is for people to clock a sub-4.3 time, much less a sub-4.2. (Jocoby Ford was the only player to clock a sub-4.3 this year at 4.28).
So time to band together and let the search begin. Who is the fastest flat out runner WR on our team as of right now? This is somewhat irrelevant however, because field speed is different from straight line speed. No one ever gets into a 3-point stance and runs straight for 40 yards.