I think you seriously underrate Tibau. He's a huge LW and has looked very good over the past couple of years. He also has the best TDD in UFC history in terms of percentages (and 2nd most TDs ever behind GSP). Benson is 5th highest TD completion percentage in the history of the UFC, so the fact that he took them both down with relative ease isn't all that surprising. Saying Nate and Jim are equal because of that is like saying Okami and Dan Miller have the same TDD cos Chael took them both down with ease.
I will be sure to rouse you when he submits someone other than Shalorus