I'd bet there are a hand full of others also. Google says the nfl didnt start electronic 40 times until 1999 and nfl requires 5 years post retirement for HOF. So the window for players in HOF and in combine after 1999 is very small.While before 40's became a big thing I find it extremely likely Bob Hayes would have been a sub-4.3 guy. Hell, if he time warped into today's combine it's entirely conceivable he would break the 40 record.