I've never received a real answer to this question: Why did this hypothetical glorious Messiah not get in while people still were and run in the actual campaign? I mean with a field this weak this unbeatable savior would've just waltzed to the nomination.
There are only three real messiahs, as you put it, who decided not to get into the race. They were Jeb Bush, Chris Christie, and Mitch Daniels sort of. Daniels has become a messiah only in relation to the current field. Perry, who did run, was never a messiah to anyone who had ever seen or heard him speak.
In terms of Jeb Bush, he chose not to run last year because he didn't want his brother to be a campaign issue. That's what Tom DeFrank wrote anyway and he has many sources in the Bush family. My retort to that thinking now is will the people who hate the Bush name really not hate the Bush name in 2016? I doubt it. It's always going to be a problem.
Chris Christie chose not to run because he said he wasn't ready. I believe him, but I also think he didn't want to campaign for two years. He said as much to Piers Morgan last Fall. When he announced he wasn't running, polls showed him ahead of the Republican field and even against Obama. I assume he's got some skeletons in his closet.
Mitch Daniels probably wouldn't have gotten a lot of support had he jumped in last May, but he would now because we're so disgusted with the field. He didn't run because his wife and daughters didn't want him to run. As you've probably read, they have a unique history that might not have sold well with social conservatives.
I think Jeb Bush would be the best bet to run and win, but I also think Christie could as well. I'm not so sure about Daniels. The one wild card is Marco Rubio. He would be an instant hit with the whole party, but would he have the stones to run now, even though it's way ahead of schedule? I doubt it.