I agree that it depends on your stance. You can't do it when your body is square to your opponent. Mike McCallum had so many options at his disposal and his stance had a lot to do with it.

Looking at the left hook, it does not have to be a 1-dimensional punch. I think that just like the jab it can be deceptive and in that aspect can access a lot of different angles that many guys haven't considered. Every single guard has an opening that's ripe for the picking. I think that just being able to make simple adjustments in the way that you throw your left hook so that you have a more angles to choose from is just one of the ways that you can give your left hook or any punch for that matter deadly and with more variety.