Who was the greatest at 160? Several fighters like Emile Griffith, Ray Robinson, and Ray Leonard are not in the poll because they had their best runs at welterweight, while Roberto Duran was at his best at lightweight, and Roy Jones and several others were at their peak at light heavyweight.
How is Robinson not an option here? Because he was better at welterweight? That makes ZERO sense. Regardless, the Top 4 is pretty much a complete lock between Greb, Robinson, Monzon, and Hagler. Those are really the only 4 names needed in a poll like this.
Okay, I should have put him in the poll, but it's too late now. I always think of him as a welterweight, he did have a great run at or near 147 - he seemed almost invincible for a time in the 1940s. I was thinking about those first two fights with LaMotta where he was below the welterweight limit while LaMotta was slightly above the middleweight limit. Perhaps, but he had very few fights at middleweight, many at welterweight and some at light heavyweight.
One of the first fights I ever watched was Tito vs Hopkins. So based on his activity Hopkins was the contemporary great in my generation of fan friendliness.
Consider: Harry Greb was a middleweight who fought and beat the best heavyweights of his time, neither Monson nor Hagler ever even fought light heavyweights. Tito Trinidad was a much smaller fighter. Hopkins started at light heavyweight.
Roy Jones is H2H the best at this weight although he moved up to LHW. I am sure he beats all of them.