Donaire of all 3 has consistently shown pound for pound level accomplishment
and not just ability. He demolished his way up to 122, picking up some real P4P level wins, like Montiel. People take away from him because of his performance against a "negative" fighter like Narvaez. Super bantam is his 4th weight and people are already calling him to fight the best there. That speaks volumes.
Martinez fought the massively avoided Williams to a controversial decision when both were P4P #4 and 5. Then he moved up and whooped the man at MW in Pavlik and fought Williams again, winning by brutal KO. Whooped a solid opponent in Dzinziruk. No one wants to fight him at 154. He looked a lil vulnerable in the Dzinz fight and on, but this was still at MW which is why I bumped him down but otherwise he'd be solidly on top.
Ward, while being the man to beat at 168 hasn't shown anything that shouts "P4P level" to me other than ambiguous "H2H ability" and "being the man". He didn't beat any top 10 P4P, didn't beat any top opposition at other weights. He won the super 6 but that's it. If he beats Dawson AT 175 then he might have an edge against Martinez. In fact I have Ward on a similar level as Bradley in terms of accomplishments.