While Ivan Drago was a great villain in Rocky IV, he was essentially just a tool in a much larger machine bent on domination.
Basically he was Dr. Frankenstein’s monster, not the creator himself.
It sounds as though that will not be who he is in Creed II, because years of hardship have made him a very different person and now he wants to break Rocky.
His coldness and apathy to the damage he inflicted were products of that; he said “I must break you” as a function of duty, not desire.