Another Park Reservation Question... HELP!

Hello my Disney friends. It's been awhile. Missed everyone.
I'm planning our first trip since park reservations began. I've searched everywhere but can't find an answer. Here we go.
It will be 4 of us. I've made all the park reservations...no problem. On our last full day we decided to do AK in the morning, return to resort for a nap, and head to MK after 2:00. We have park hoppers. One of my party has snagged a golf tee time for that morning so he won't be going to AK with us but will be going with us to MK later. I still have him going to AK with us in MDE in the park reservations. What do I do? Cancel just his reservation? Will he be able to go to MK with us if he doesn't go to AK in the morning? UGH!!! This new system is so confusing!
TIA for your help.

You are correct, with the current state of park reservations, you have to visit your reserved park before park hopping.

The easiest solution would be to change just the golfer's park reservation to MK from AK, so they can visit MK anytime that day and not have to worry about another park at all.

Oh wow! Thank you so much for this info. I took your suggestion and changed our golfers reservation to MK. Whew....I think I can relax now. Thanks again.