My comment is somewhat off topic, but my understanding is that the olfactory part of the skull has much to do with the ability to smell.
Now I fully agree that our canine friends can smell many times better than a human, as this story illustrates.
What’s off topic is my going to T-Rex. The loons trying to recreate their behavior state they had a great sense of smell simply because the olfactory was so large. If that’s the case, then a dog’s should be the size of a basketball. My contention is T-Rex’s was so large simply because it was so prehistoric and in early stages of evolution where it was large for reasons other than a great sense of smell.
I would say the T Rex is more akin to a giant Hyena. Present day crocs have a great ability to detect smells. That is how they can find rotting stuff from a great distance. Their sense of smell is vast. I would suspect T Rex would have such a ability to locate large dead animals for consumption.