I had a friend who is trained by john smith and I did the program with him- and everyone in the squad got burnt out, or injured.
The volume of training HSI do is too much, the warm up last 1 hrs, the track volume is huge, repeat 6 sessions a week- older sprinters won’t succeed on the program. If Crawford didn’t have years of wear and tear he maybe suited to hsi - he still might post some good times if he can handle the work but I have my doubts.