Benitez is so underrated he would beat ANY fighter from 140-154 today at his peak, Mayweather would be the only boxer I would give a chance against Wilfred and I see a Benitez decision.
Any one ATG could be pound for pound king. Julio Cesar Chavez today would be p4p #1 as he would have no competition between 130 and 140. SRL would be #1 p4p today dominating 147-160. Heck Wilfredo Gomez could be p4p #1 from 122-130. Great fighters would do well in any era.
SRL SRR Whitaker Hearns PBF Winky Off the top of my head...with time I could think of more that would beat him. And I love Benitez...but your a tad off.
I said today at his peak. Winky would beat him but Wink can't make 154 anymore. Robinson stops him, Leonard, and Hearns of course beat him, Floyd has the most trouble with Benitez though and I would give it a 60/40 advantage to Benitez.