Sorry if I am dense, but can I ask a point of clarification? If you are *not* part of the Magic Band/FP+ test group, should you keep your tickets unlinked from MDX? Can you pull separate fastpasses with both your KTTW card and park ticket if they are linked on MDX?
I am not part of the test so I called and asked what MDX linking does. As brettb explained, linking tickets to MDX is for visual purposes only unless you are part of the test group. If you want tickets linked to a room key you need to do that at the resort.
Based on this, it sounds like linking on MDX does not prevent you from being able to pull separate FP with both the KTTW card and park ticket.