Okay, so I guess the first question would be, what exactly is your win-con outside of Elspeth?
Prophet of Kruphix is great and all, but it really only shines when you're using the untaps and flash to play other creatures that will actually affect the board-state and potentially bring you the victory - think Sylvan Primordial, Arbor Colossus, Prime Speaker Zegana, Polukranos, Aetherling, even Angel of Serenity, etc. As you're currently constructed the opponent can really just hang out while your two power creatures don't do a whole lot.
Sure, Ajani and Kiora give you alternate win-cons either through pumps or trying to get Krakens out, but I don't know that you're really sitting on the strongest strategy as a few well timed counters/PW removals and you're SOL.
You're also making some pretty heavy handed mana requirements in terms of colored symbols without any shocks. Think, Plasm Capture and Supreme Verdict are both spells you would like to have at your disposal come T4, yet, their VASTLY different colored requirements are going to drop your consistency to almost nothing. At the very least you would want 2-3 Chromatic Lantern or Sylvan Caryatid to try and fix the mana.
I'm not trying to be the super downer, I just think that Ajani will be MUCH better suited in a more solidly W/g or W/G build. Think mono-white mid-range with him as a finisher with Elspeth or even a pure Selesnya or Junk midrange, where he pairs up with Fleecemane Lion, Advent of the Wurm, Reaper of the Wilds, Blood Baron, Obzedat, and things of that nature.
Someone might prove me wrong, but I don't see him working in a control build. Now if you want a more creature-centric bant build, with him, Kiora, and Elspeth, that might work - but you're going to have to move away from a control setup toward something a bit more mid-range to really get the job done.