“Note: Mach 25 is orbital, thus not reacting with atmospheric friction in the same way.”
Not really true. Re-entry conditions are Mach 25, 180 db, and 3000 degress f. Look at some pictures of the bottom of space shuttles. That must have been a wild ride back into the atmosphere even if it only lasted a couple of minutes.
Noted. Though full speed of a Mach 25 range, would not last the entire re-entry period, would it?