I feel Roy wasn`t as good at opening fighters up like C\anelo and B-hop are/were and Toney couldn`t close the distance that well when he was a bit exposed by Roy, so who is the weakest link at 160 out of these four?
Canelo, is the weakest link. And it's not close. I don't quite get your meaning of " opening a fighter up". But Jones at Middleweight simply overwhelmed everyone he faced at that weight with pure atheletiscim. He didn't need to " Open his opponents up". He simply beat the hell out of them.