Address it to DB, and include OH as a courtesy if you have any relationship with him.

It comes down to decision theory, Choice under uncertainty.


The simple matrix is below

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/knCmz.png

The consequences of including OH is that at the very worst, he will be mildly unhappy.  But, if you excluding him, and he's likely to be upset, he will be VERY upset.

Logically, you should include him, as the risk is minimal.