It was reported in a local magazine just after the fight. (Boxing World) Basically it was a big article on Hop, wherein it said he admitted to studying Trinidad's style years before, as he always knew they would end up meeting one day.
Trindad should have never been a Middleweight. Jr. Middleweight at the most, IMO I give Hagler 3 rounds before he dispatches Trinidad. (Trinidad's Middleweight & Beyond has been a waste of his career) Welterweight/Jr.Middleweight Trinidad is an ATG. Middleweight he's a GOOD fighter.
I dont say his styles all that bad for him. Sure Hagler's very strong, but tito only lost to skillful boxers with and good jabbing(Bhop, Jones, Winky, De la hoya), anybody who brawled or got close got KO'd.
I'm not too sure about this big size difference. Remember that Tito was making 147 in the day before weigh-in era, and had trouble making the weight. He was a big welterweight who moved up to 154 in 1997, but went back down to chase the big money fights, which he got in 1999. I get the feeling that Hopkins is the type of guy to study most fighters' styles carefully for a long time, if they are big names near his weight class.
Yeah, Hagler was a skillful outfighter. He'd probably have a field day with the jab. Trinidad wasn't the best guy when it came to guys using good jabs and lateral movement, his footwork was rather ponderous.