Gatlin trains under Mitchell already since 2010.
So we have:
*Mitchell being guided by Graham,
*Graham being Charlie Francis' stopwatch coach,
*Gatlin being trained by Graham,
*Mitchell being as dumb as sh*t.
Who do you really think is in charge of training Gatlin now?
From the above 3 coaches 1 is dead, so you have a 50% chance of nailing it.
I'd go for the option of Graham still being the puppet master.
That whole team never learnt to practise this sport without chemical assistance. The whole regime is based on a high workload with an improved/enhanced recovery protocol. They don't know anything else. Fact is that within that group only a selected few are getting the 'special treatment', so you see a downhill spiral in the other athletes, simply because they don't cope with the high workload running clean.
But let's be honest: Gatlin is always good for exitement. Better to watch a doped to the guils sprinter than anorexic distance runners running lap after lap after lap.