AP Tour Discounts

I am going to WDW next week with my wife; when we get there I plan on bridging one of our tickets I from UT from 6 days to an AP since we plan on coming back a week earlier next year. Can someone tell me if the tour discounts apply to other guests your bring (in this case, my wife) or only to the AP holder? It doesn’t make as much sense to do any upgrade if the tour discounts don’t apply to both of us - and I can’t see a ton of value in upgrading tickets to AP.

AP holder only.