Was leaving Roach the best move Khan ever made?

[FlatLine]

When he got with Roach fans where saying that was the best move Khan ever made.

At the time it seemed like it was, Roach appeared to improve Khan initially, but in hindsight that might have actually had a lot to do with Ariza's strength and conditioning and less to do with Roach. And higher quality sparring at Wildcard could have played a significant part.

Within 2 fights of hiring Roach, Khan moved up a weight division so his apparent improvement might have been aided by the fact he stopped weight-draining himself at the time.

There's a lot of factors which could account for Khan's apparent improvement in addition to Roach, maybe collectively they all helped, but it's not certain that any single factor was the dominant one.