Update #??? My FP's appear to be still good 6 days later.
In addition, I did add 2 more days of FP's to my original 3 days. In order to this, I had to reassign my AP's from my main profiles to the phantoms, book the 2 additional days of FP's and then reassign the AP's back to my main's. I did this about 48 hours ago. So now I have 5 days of FP's on my phantoms and they still only have a MNSSHP ticket linked to them.
My below thoughts are just guesses and come tomorrow, could all be a waste of space!
Any active ticket will allow you to make FP's in advance (and depending upon the ticket, will allow how many days of FP's you can reserve in advance, which we already know), and any active ticket (or maybe not?) will hold those FP's for you on the phantoms regardless of the number of days on the active ticket. So as a result, you could have a profile linked to a 1-day ticket, but 7 days of FP's associated with it (because you used a 7-day ticket to originally make the FP reservations). And like what ScrapYap mentioned in an earlier post...anything that potentially raises a flag about your account (like reassigning AP's multiple times in a short time span or possibly having FP's associated with ticketless profiles), will have Disney then check to make sure everything is in order.
I don't think the system currently automatically checks, you need to do something out of the norm that triggers it to check...and then if there is something not right with your account/profiles, Disney will send out the warning e-mail, potentially lock your account, send you to a locked room with Judge Frollo for 10 minutes, etc.
Also, thanks to all in advance who will be in the parks over the next few days trying out all of these different scenarios!

Evan