I was told that Ace had been found a place at stud – but my source isn’t too reliable at the moment!  Coolmore plans are still in flux for next season right now.
I wouldn’t want to send Rumplestiltskin to Galileo – although he has had success with Danehill mares already (most obviously Teofilo), her dam’s side doesn’t seem to gel with the Sadler’s Wells line, producing mainly ropey hurdlers.  The trend in the dam line at the moment is to send fillies to AP Indy, but all the produce are too young to see the results yet.
Medicean would be an interesting one.  He’s had 5 FORA so far out of Danehill mares, of which 3 have won, including Nannina and Regional Counsel.  Two Group winners out of 5 isn’t a bad effort.  The downside is that the foal would be inbred 3×3 to Mr P, although obviously this would be the same problem with Hawk Wing.
Giant’s Causeway looks a much nicer cross on inbreeding, 4x4x5 to Northern Dancer, but none of GC’s blacktype horses so far have been from Danehill mares, only 2 ordinary winners, which isn’t a great FORA/winner ratio.  Still probably looks the most likely candidate out of the Coolmore stallions though.