I too think it's a mistake. Not a major one.

There is this exact feat in the Quintessential Warriors book by Mongoose. You can use double your STR bonus for attacks and damage, but you can't use Improved Initiative. Not saying that you can't have it on your character but you can't use the two together. And as far as I know you can use Power attack as well.

But now were all wondering about it. I really don't see how asking this brakes the trust bond. Your not accusing him, your just wondering what we all missed.