i would agree with the "if shit was onsite laying around", then its a concrete curing issue, or manpower issue.
From a contractors point of view, im still going with they know what they are doing, and understand the timeline, etc. Basically, im trying to give them the benefit of the doubt, i know first hand that everybody behind a keyboard knows how to handle, and complete the project better than any contractor.
Im not sure how much "supply chain" this can be blamed on. This project has most likely been going on behind the scenes for a year. Im getting used to things taking longer than normal, right now i have orders for trucks and trailers that are 6-8 months out. So, at the minimum, we knew this lift was going in 8-ish months ago, so i guess my point is, if they tore main/burma down without knowing if all their stuff was going to show up on time, then that might be a mistake on their part.