Incomplete means not full or finished and/or not having the necessary or appropriate parts. Failure means lack of success, seems pretty different to me
Since when did Ragna say that he didn't think she was murakumo unit? The Azure Grimoire probably didn't react to her because she wasn't tempted at the time. And Lambda was really just for testing because in the beginning of her story one of the scientists say she was made for the sole purpose of their research.
I wouldnt EXACTLY say Mu-12 was a failure, just Take-Mikazuchi interrupted her tempering and what was produced after was Noel. They others just assumed she was a failure. I personally think Lambda was created just for testing. Mu-12 is actually described as the perfect murakumo unit, Kusanagi.
I have a quick question, are all the Murakumo Units related? Like a sister relation? And if all the Murakumo Units are clones of Saya, are they related to Ragna, Jin, and Saya?
I know the Murakumo units are replicas/clones/copies of Saya but are they all related? Like sisters by any chance? For example Noel, Nu, and Lambda?
P.S.: I know Lambda is technically dead and Nu is using her body