I've never seen footage of Greg so it's hard to say. Based on the men he's beaten I have no issue ranking him as one of the best MW fighters who ever laced them up. I also have no issue ranking him a slightly better fighter than Tunney. I have him within my top 5 MW and my top 50 ATG. But picking him in individual fights is very tough. The best I can do is say he'd be a favourite.
Another fine individual believes Gabe "Greg" Rosado to be one of the best 160's of all time. A difficult but endearing opinion.
The problem with that is his only noteworthy victory at MW is against Joshua Clottey. I find it hard to qualify that as enough to rank him amongst the best ever MW fighters.
Well Rosado was beaten every time he stepped up even in this moderate era, so you really wouldn’t fancy his chances against Harry Greb.