So as I understand the current fastpass situation - if I have a Tier 1 at HS early (say Toy Story Mania) in the morning and a Tier 2 later in the day (say Tower of Terror), as soon as I scan Tier 1 fastpass I can select a Tier 1 at Epcot with whatever is available at that time.
But if I schedule 3 fastpasses for HS before I arrive (say Toy Story, ToT, and Star Tours), can I cancel one of the the Tier 2 fastpasses that day and pick up Tier 1 in Epcot? In other words, does it matter if I cancel one of my fastpasses to pick up the Tier 1 for Epcot to get down to two original fastpasses, or do I need to not schedule them in the first place? This way, if none of the available Epcot Tier 1 fastpasses are to my liking I can just keep the third one at HS.