REMEMBER how many posters who said Tirunesh had too much speed to ever be good at 10000m when I stated"she would be one of the 2nd sub 30 min 10000m runner and also got the 3rd correct? Many s5ated both had way too much speed and was more of 1500m/5000m type runners and yet Tirunesh is now a sub 2:18 marathoner.
Very few but there are some raw athletes that can have hella speed and still morph into legitimate ELITE distance runners. Also look at Lagat, Kipchoge, Bekele, Gebresellasie sub 3:32.5 1500m who have conquered the marathon.
I'm not asking you to believe Brazier can run sub 3:30...I'm informing you that if he took it seriously and focused enough years he will get under 3:30. You dont run sub 15:10 in high school xcountry and 4:07 mile off less then 30 miles without uncanny endurance. In his case yet to be tapped as he still under 40 mpw. He is a slightly better version of Seb Coe, Stev Cram, and Sydney Maree oh yeah and Saud Aouita 1:43.8 800m in one season and 27:20 in only 10000m less than 18 months apart. He is only 22 give him time to get some 45-55 mile weeks for a season or two and watch him all the way to 3000m possibly 5000m.