Fadeev looked like he might be the one to beat in the 85-88 quad. He was a medal contender at the 84 Olympics but a bad short program cost him a medal. He medalled at the 84 Worlds with a spectacular free skate. He dominated the 85 Worlds, winning all 3 portions to win gold ahead of the favored Brian Orser and the rest easily. He had such a huge lead at the 86 Worlds he only needed 3rd or 4th in the free skate to win, which meant even a program with 2 or 3 errors would have been enough, but he blew up and ended up 5th in the free and dropping to bronze, gifting the gold to surprise winner Brian Boitano. He scored several 6.0s at the 87 Europeans but could not duplicate that performance at Worlds and again dropped from 1st to 3rd. He then finished a very dissapointing 4th at the Calgary Olympics.
He looked to be resurgent in the post Olympic season, beating Petrenko to win Nationals, and winning Europeans with perfect 6.0s again. After placing 1st in figures to 5th for Browning he could have wrapped up his 2nd World title in the short program but fell. He still led going into the free but blew up and dropped to 4th. He beat Petrenko at Soviet Nationals again in 1990, and finished 2nd at NHK behind Petrenko but ahead of Browning, so looked like a contender with Petrenko and Browning for the 1990 World title but WD just before Europeans and never skated again.
As a pro he appeared off and on. Wasnt a big name in the U.S so opportunities were limited.
Could he have been one of the greats. He seems to have had lots of opportunities but always fell apart at big meets like Worlds and Olympics, while skating his best at Europeans. He also didnt really improve after 85, stagnant artistically and skating often strange and boring programs. Combine that with inconsistent jumps and he found himself stuck in a 3rd or 4th rut in big events after his World title win.