This logic is flawed because Hit Points are not a wound tracker, they "measure your ability to stand up to punishment, turn deadly strikes into glancing blows, and stay on your feet throughout a battle." Being at full HP doesn't mean your character is "intact", it means he has all of his capacity to stand, be at his feet functioning and not down and dying.
A boat's Hit Points represent its ability to float and not sink. If I burst a hole in its hull, it loses HPs, it loses some of its ability to float. If I fix the hole, it regains Hps. But if instead I throw away some of its extra cargo, or if I attach some barrels to his sides, the boat heals because it recovers its ability to float. In D&D if an intact boat and a boat with holes and barrels attached to it have their maximum float-ability, they are both at full Hit Points.
Nowhere it says in 4E, and I think not in any D&D edition ever, that the effect that recovers Hit Points must "counter" the effect that made the character lose Hit Points. They are independent things, adding or subtracting to the same abstract variable. The character loses HPs because he was wounded by a sword, and then regained some Hps because his friend gave him some encouraging words, or he had some adrenaline or morale burst, or whatever effect that increases his ability to keep up on his feet fighting.