I disagree. Tables and context are easily separated; this might lead to some confusion for people down the road when people and writing out combos elsewhere and are forgetting to write in the OD header, or accidentally reference the wrong header.
Furthermore, you still have to write in the percentage for combos that rely on a percent that lies in the middle of the bracket.
Therefore, I approve of the OD## concept. It keeps the numbers in the combo, so they don't get lost. Having [##]-Combo format also works as well, and has it's ascetics, but either method should always be implemented. Using the Header-Grouper format is nice for organizing combos on lists, such as the wiki, but should not be used in place of actually writing the number somewhere in the combo. Which is what I'm trying to say.