A) construction is just part of the jigsaw. Training is a bigger oneI feel like it would behoove them to try to get this one completed as quickly as they can. Epcot needs something new now to bring guests into the park. Sounds like they are struggling to do that at the moment. Why not allocate all resources/labor to this project. Guardians and Tron weren't going to be completed this year anyway.
B) There is some debate if they want crowds descending on a debuting attraction.