One of the main reasons OD isn't used in neutral very often (besides the obvious lack of overall impact), is that it's generally too easy to avoid. Pop OD at neutral and the first thing people are going to start doing is high jumping and double jumping away from you to avoid it.
While you can use this to your advantage, grab proration tends to make it a waste in comparison to a more beneficial confirm. Another example to the situation is Hakumen's Mugen. Even with the changes it causes with faster and farther kishuu movements and with OD extending the length of time, most people's first reaction will be to jump and run away to avoid it, and you waste most of your time trying to chase them down.