Direct monitoring through OB

hiya - I fear I know the answer and have yet to even install OB:
I wanna multitrack an OT performance using the 4 inputs of my interface. works fine as I’m using direct monitoring so latency isn’t an issue.

now I would like to add the A4 in via USB/OB (as all my interface inputs are occupied) - am i right assuming that I won’t be able to get direct monitoring anymore?

forgive me if this question reveals how little knowledge of digital recording I have

edit: realizing that my question is somewhat answered by myself. 'spose it wouldn’t work