so if you compare amos and brazier's times they are pretty similar, and then that means brazier could run 1:42 this year or next
"At the 2011 African Junior Athletics Championships, Amos ran a Botswana Junior Record time of 1:47.28. Further improving on his record, Amos finished fifth in the 800 metres at the 2011 World Youth Championships in Athletics.[2] In 2012 he improved his National Senior Record to 1:43.11 during a race in Mannheim. He became champion at the 2012 World Junior Championships in Athletics, finishing in a new championship record of 1:43.79. In the 2012 Summer Olympics, Amos won a silver medal in the men's 800 m race, the first Olympic medal for his country.[3] His time of 1:41.73 established a new World Junior Record behind the new World Record set by David Rudisha and is tied with Sebastian Coe for the third fastest individual ever.[4]
After an injury filled 2013 season, Amos returned to form in 2014. At the 2014 Prefontaine Classic, Amos set a meet record and world leading time of 1:43.63.[5] At the Herculis IAAF Diamond League, he again set a meet record and world leading mark of 1:42.45.[6] Beating Rudisha for the 2nd time on the season, his performance was the fastest 800m race since the men's 800 m race. At the 2014 Commonwealth Games, Amos won the 800 meter Gold medal in 1:45.18. In the tactical affair, Amos maneuvered out of a box to pass World Record holder David Rudisha in the last 50 meters."
so it looks like he ran 1:47 as a 17yr old, then 1:43.11, and a 1:43.79, then 1:41.73 and the olympics the next year
brazier ran 1:48.07, then the next year 1:43.55...so lets see what he does at the trials, my guess is a low 1:43, and then lets see what he can do in rio!