I'd think he will be pretty much told keep the sled clean and rubber side down. That is all he is there to do, nothing more, nothing less, and let Zach do any challenging and racing.
BTW, Paul Brown, lifetime Cat racer - on a Polaris for the Soo.
Now, not knowing the behind the scenes stuff going on, but if I'm Zach, I'm taking Paul as a teammate long before I take Trout. But that is me.