It's obvious that you can solo heal, it's easy as shit this fight.
Having 4900 HP as WHM, with a PC and without latency I'd beat Titan typing with the feet while watching TV and playing on PSP.
If you can't solo heal it, then you can't even do it as 2 healers.
And with my 5 seconds lag PS3 I can't do it even knowing by heart every single mechanic and rotation of the fight.