DIII can be very misunderstood when it comes to pitching.
Krak may have overstated slightly when he referenced 8-10. But certainly 5-6 touching 90 is not overstated at DIII. Trinity, Tx, where Krak's son attends has more than 6 who touched 90, one of whom is currently carrying a .70 ERA playing for Vermont in the Ny/Penn league. Others with 5-6 touching 90mph would be UT-Tyler and Cal Lutheran. UT-Tyler has already had a number of pitchers drafted even though it is only in its 4th-5th season of play. They bring in a ton of Texas JC kids.
CLU, for some reason, had several DI pitchers transfer in including one from USF and another from Fullerton, both of whom were in the 90-92mph range.
I am sure there are others.
On the other hand, touching 90mph does not mean they do it with command at the DIII level. A few do.