This ended up being a problem for me on my last trip. I have an MDE account and was linked to the person who bought the Memory Maker. My husband does not have his own account. So he is just a guest on my account.
We had a couple character pictures that he scanned his MB for without me being aware of this technicality. Since I was in the picture as well, I was able to contact Disney and they located the picture for me. So, as long as you are in the picture, there is a damage control option if an eager beaver member of your party scans.
I just set up a share for our upcoming trip and linked based on how we are touring. My band is linked as I will basically be riding everything. My sister’s band is linked because she’s pregnant - so will be the Memory Maker band for those not riding thrill rides when we split up.
We also got a little crazy, and the two bands that are linked to the Memory Maker account are also the fancy bands (minnie mouse and guardians) the rest are just colors… but that’s just me being hyper organized