Here are pictures of my old highport plenum. You can see in the first pic the feed for both from the intake piping is on the left, the feed for the AAC is in the middle, which is from the same feed for the IACV. Then you can see the outlet from the AAC goes to the plenum next to, but not inline with the IACV.
In this one you can see the relation of the IACV location to the AAC outlet.
This one shows the inside of the plenum, and you can see the tube from the AAC is separate from the IACV. They only share the same feed from the intake piping.
I know for a fact the AAC is closed after a couple minutes of the engine running, it's only there for cold starts when the engine needs more air. I have no clue what's going on with mine and why it keeps going through IACV valves. It's always the same thing, I will get it idling great for a few weeks, then while driving it the idle will randomly start acting weird, and the CEL comes on for the IACV and it never idles the same until I replace it. I'm getting sick of going through these all the time.