Just to be clear, this is not Loonies fault if he can make it to the top. It's the developers fault who haven't designed the system properly, can't/won't fix force quit, no opponents and broken peace treaties. Players like Loonies love to see how they can break the system and get ahead of the pack, all within the limits set by the game, no cheating whatsoever. Just being smarter than everyone else.
If BHG doesn't want him to win this way, they can allow everyone to attack everyone based on medal range. Then he'll get crush by an IA army and this won't happen again. This will fix the no opponents issue to a certain extent as well.
And for the devs, don't worry, people with max IA army won't be lurking at 200 medals to smash a bronze age base for fun. There is no loot to be taken so no one will do that. People will only start climbing the medal ladder when they are ready to compete. The high level accounts will still be at the top for the big league bonuses and leaderboard competition. I don't see a risk of IA players abusing bronze age players just for fun.