I'd have to seriously consider Griffith's chances against Hearns at welterweight, he has the combinations that are right out of the top drawer and Hearns isn't going to do Rodriguez (outboxing mode) job all night imo, Hearns is hittable against a man who has every chance of emulating Ray Leonard's late onslaught. Hearns has a huge chance also, for blatant reasons.
Granted he had a very short career and doesn't have quite the depth as most of the top guys at the weight, his high end wins are pretty damn good, people criticize the rematch against Duran but a win is a win thought the 1st fight always tells the story Leonard still proved himself to be one hell of fighter even in defeat in Montreal. Not to mention, they may have not been a better all around fighter to ever grace the division other than the TRUE Sugar himself.
The thing is, I'm not sure Benitez, Duran or Hearns are truly great welterweights at all. I mean, Hearns was an awesome boxer-puncher but his resume and experience was lacking. Benitez I dont feel is an historically great welterweight, he was more known for being a "wonderkid" and reigning at 140. Duran maybe had the best credentials, and it took Leonard two attempts to beat him. I think those three wins get blown up too much when people are saying they do enough for Leonard to put him in the top 2 welterweights ever. Edit - i'm not saying he had to beat a LOAD of GREAT fighters, I can rank a champ as great for beating good and very good fighters in depth, or for beating a few who were really great at that weight. I think Leonard's welter resume comes sort of half-way in both areas.
I understand what your saying and I agree that Benitez and Hearns aren't actually in the top tier at the 147 lb limit (Hearns doesn't make my Top 10, while he is Top 5 in most people's list). Doesn't change the facts that they were great wins against great fighters in their prime and he displayed some of the most exceptional skills at the weight that warrants his placing. I personally have moved Gavilan ahead of Leonard and theirs a case for Napoles and Griffith being ahead of him at the weight. A matter of personal preference really.
Hearns has a chance to take Griffith out early like Carter did imo Personally I dont rate Griffith up with the other elites and I'd give Galivan a better shot, don't think he'd beat Hearns though
Like i said, Hearns' chances are clear, and i didn't favour Griffith, but seen as though i do rate him head to head, especially at 147, where i suspect this bout is, then i would seriously consider him for the reasons i stated.