Right now, it is the nearest squad member that comes to heal you when called which makes them lose a medkit for healing themselves. It should be the Medic that comes to aid, if he’s too far then let the other squad members within proximity.
Bots within proximity of the Medbox will pick medkits by themselves, which would be a good way to buff the usefulness of Medic as two medkits would help the bots’ survivability.