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Elemental Escalation is not caused by the result of an attack roll but by using a sorcerer at-will attack power. :P

''Each target hit by the attack takes'' is the determinant for who gets the damaging effect and not the trigger causing the effect.

Trigger: You use a sorcerer at-will attack power.

Elemental Escalation is not exactly like how all attacks work because its not a Hit effect from an attack roll result.

No. Elemental Escalation is not a Hit line its an Effect line.

Its an effect affecting creatures that have been hit by another power.

No your point is that its a hit effect. Don't steal my point 

''Each creatures hit by the attack takes'' is a target designator for a different triggered power's effect, not a Hit effect.  

I am not claiming that the result of a hit determination of an attack roll isn't part of an attack, i am claiming that designating a target (that has been hit by an attack) for an effect doesn't make it part of the attack.

You really see no difference between these two hypothetical powers below ? Only one of them would be in addition to the triggering attack's damage and be maxed if it was a Crit. Yet on your opinion both are identical and their effect become part of the triggering attack hit's effect. I say only the Power B's effect will be part of the the triggering attack because the extra damage rules say so.

In the same vein Elemental Escalation's effect has extra damage (in addition to the triggering attack's damage) and ongoing damage (not in addition to the triggering attack's damage)

Power A                                                                       Power B
Trigger: You hit a creature with an attack                   Trigger: You hit a creature with an attack
Effect: The target hit by the attack take 2d6 damage    Effect: The target hit by the attack take 2d6 extra damage