Of the Irish lot, Nevin is the cream of the crop and has the kind of slickness and movement which is vanishingly rare amongst Irish or British boxers. He could be a very successful pro, if he is brought along well. Conlon is very promising, but he's also a kid and should certainly stay in the ams for the moment. Barnes is a great little fighter, and should have won Gold, but he's so small that it's difficult to see how he could carve out a pro career given that there's so little interest in fighters of his weight. Nolan has a completely amateur style (and an ugly one at that) and would make a terrible pro. I would pay money not to watch him. O'Neill has talent, but I think he's likely to stay in the ams.
Generally, the best boxers of the whole (men's) competion in my view were: Lomachenko, the Ukrainian lightweight, and Ramirez Carrazana, the Cuban flyweight. Unfortunately, we won't be seeing either of them in the pro ranks any time soon, as Lomachenko has signed up to the AIBA's semi-pro world series thing and the Cuban is, well, a Cuban. After those two, there was a very high quality bunch it's hard to distinguish between, not all of whom won gold: Usyk, Campbell, Sapiyev, Nevin, Iglesias, Berinchyk and Savon all impressed me a great deal.
As usual, the quality of the judging was a lot lower than the quality of the boxing.