While the 26-year-old heads to his home Olympics as the World and Commonwealth champion, he didn't defend his European title in Helsinki this week, this year’s best time of 48.96 seconds places him 12th fastest globally.
To a certain extent that stems from the effects of knee surgery undertaken in the winter, an operation he kept secret from his rivals including Puerto Rico’s Javier Culson and Americans Angelo Taylor and Bershawn Jackson, who claimed Greene was ‘cashing cheques his body can’t cash’.
But even at his very best, Moses – who set new benchmarks in the event over the course of his 122 consecutive race victories including four world records and two Olympic medals – is yet to be convinced by Greene’s credentials or his World Championship winning time of 48.26seconds.
And while Moses steered away from nailing his colours to either of his compatriots’ masts, he believes the event will be one of the most open track and field events at the London Games.
“It is going to be a tough race [for Greene],” said Moses speaking at a Sports Journalists’ Association event, in conjunction with Laureus.
“It will not be as easy as it was at the World Championships. That was the slowest race in years at a major championships.
“The US have got Bershawn Jackson and Angelo Taylor and they are picking their team this week but I don’t think there’s a favourite right now. Because of his [Greene’s] time a lot of other athletes will see this as their opportunity. He will have to run a lot faster than that.
“It comes down to who is capable of running at 46seconds and do what it takes to win a gold medal.
“You have got three Olympic or World champions in the US that have to make the team.
“If these three guys make the race it is going to be a really exciting event. Then you have another guy, Puerto Rican, so there are six guys there with the capability of running sub 47. Who is going to hold it together? No one has been that consistent; there’s not one person who you can point out that you can say he can beat them all.”