FWIW, the fastest time I've seen for Nixon is a 4.57 recorded last month while Howard ran a 4.44 at the Army combine in Jan. 2011. Both measured 5-7 but while Howard weighed in at 170, Nixon weighed 190.
Nixon's 40 time at the The Opening in Dallas last month was the 32nd fastest at the event while his 4.37 shuttle was 96th.
Still, he'll be a dangerous player wherever he ends up and he looks plenty quick in this clip from The Opening:
Highlights of 2017 4-Star Athlete KD Nixon from The Opening Dallas - Football Recruiting - Scout