I missed the voting period, but i would have gone for making the 5 point. My first instinct was to POH, and this may well be correct, but upon further reflection I came to like priming better. Why?
Well, for one we're not likely to score a gammon here, so an aggressive attacking play isn't as valuable as usual. Regardless of whether he's on the bar against a 5 point board or trapped behind a 5 prime he needs an 11/36 shake to enter/leap. The difference is what happens when he misses - if he's on the bar his strong board remains intact while if he's stuck behind the prime his board crunches. So I think we come out a bit better when he misses from behind the prime than when he misses from the bar, while it looks like a wash when he shakes the 11/36. Well, not quite, since he still has to make it around the outfield and if we get a hit with the 5 filled in we have much better containment than if we have the ace.
All that said, I think the real deciding factor is which play allows us to cash more often. I'm not entirely sure, but I think after a miss we're better off when his board starts to deteriorate.
I'm going to hold off on rolling this one out so as not to tip the upcoming cube decision.