Could you believe Charlie Francis having good things to say about Arthur Lydiard? In fact, progress in sprint training seems to mirror what has happened in distance in the last 40-50 years. All the endurance stuff--jogging, running XC to "get strong"--is gone from modern methods (many don't even do jogging duing warmups), there was a period of more emphasis on more pure speed with lower volume, and now there is some more imphasis on speed endurance and special endurance with somewhat higher volumes at somewhat slower paces following Clyde Hart. You can see the latter in Lance Brauman's training for Gay, Spearmon, and Victoria Campbell.
But there are some fundametal truths. Sprint or Marathon, muscles still require ~36 hours to rebuild after a hard session, and the issue is worse for sprints because the recovery for the central nervous system (which distance people cannot stress as much because the CNS doesn't let them go as far into oxygen dept, and there is research to show this) is significantly longer.
Also, Mo's weight sessions in season are things like 10-8-6-4-2 on squats, with the 2 being @ 435 pounds. If distance people were stressing their CNS like this 3-4 times a week, they would also train less.
Distance people often want to complain about sprinters not training enough, but consider the money. Mo demanded--and got--~$100,000 per race in appearance fees. Asafa asked for $100,000 at Zurich and was refused because they were already paying Gay $50,000 (remember, OFFICIALLY, Zurich wasn't going to do appearance fees). There is so much money at stake that if it was possible without failing a drug test to train more than the 7-10 total sessions a week and get faster, somebody would certainly do it. Most top sprinters already have physical therapy after every hard workout to speed recovery, and there is only so much stree the body can handle without breaking down.
If you were to compare Meb with Gay you would find the number of hard sessions is about the same, while Meb wlll do more easy sessions because (1) He can; and (2) He gets more out of it.