I'd argue as long as they can have the ride "Soft" during FFN, and open by Early May proper (and as thus then, running throughout the rest of FFN), things will be fine. If they're smart, they are likely coordinating this to be ready by the time they have the new security check stands for Central and EastSide ready to operate (and have WestSide be a "Temporary" means for the time being).
Small side speculation: I wonder if the Zebra train might actually be one of the main four train sets. We know they have had the main set out for testing the gates for load/unload, but I wonder if they might keep the Zebra Dodge Charger fleet just as a fun "We did this" thing as part of the set