Michael Johnson is 1-5 since USADA went into effect. If he used steroids/PEDs pre-USADA he might have damaged his body/cardio which could be why he's running into issues similar to other MMA fighters who abused their bodies via roids/peds.
On the flipside, Justin Buccholz is the 3rd head coach to leave team alpha male back in january or february of this year. Buccholz said Cody didn't get proper training for both fights with TJ Dillashaw. There's a chance Andre Fili likewise isn't getting good training with Buccholz being gone.