1. I do not think there is TIME TRAVEL involved with Emma/ Snow being in FTL. They are in current time that mirrors SB as it after the end of the curse.
2. I was under impression that Emma and Snow are looking for a way out / portal to SB…. but they have to go through hostile/ Ogre territory to get there. I would think they have to get to the area where the glass coffin is/ where Emma fought the dragon to maybe go up the elevator shaft to the library or maybe into the mine up the air shaft.
3. As for Henry and Jefferson…. Henry is a loving, forgiving child. I think he would be more concerned with Grace’s feeling then to hold a grudge against Jefferson. That would be one reason he would talk to Jefferson. If he can forgive and love Regina, he probably would not hold anything against Jefferson.