The one thing Dubois has is tremendous strength and stamina (recovery powers) This alone makes him a tough fight
Parker is going to have to stay switched on and focused the whole fight against someone like Dubois. He is coming in heavy but I'm sure his team are confident he has enough to go the 12 rounds.
Watching Parker's camp videos they seem pretty happy to keep at 120kg, I trust they know what they are doing.
Parker and his team didn't come down in the last shower. They are following the route they think will give him the best chance of winning.