[Chris]

Well, the problem is when you allocate memory, you need to destroy it. Sometimes, memory isn't destroyed or destroyed completely, so you start getting small "data leaks". Also, you would need to display these heroes in a section of the map where nobody can see them.

But the memory of a hero depends on what makes up a "unit". If it's small, then its no problem. But if it's big... then there is a problem.