I certainly didn't make excuse for Scott Buck or justify his decision. I just wanted to show that perhaps because of the time constraints he decided to sacrifice the casting and writing, because filming started very close to his announcement as showrunner, and Iron Fist had filming and post-production length same as the other show. Perhaps he's the type of person who, under a tight deadline, decide to rush the early stage until it's on schedule, then breathe a sigh of relief and do things at a normal speed, instead of doing everything on a tight schedule, or spending time on writing and casting while skimming on filming and post-production.
Whether Loeb should take responsibility on Iron Fist season 1 depends on how detail Scott Buck's pitch to him, I think. If his pitch was "Boy got in an accident, raised (and abused) by kungfu monks, then grew up and came back to his home town trying to find his inner self", then it was a solid premise and talented writers can write great scripts based on that. But if the pitch was a 10 pages of multiple times Danny not permitted into Rand building and several boardroom meetings, then Loeb should have known that it wouldn't work.
