Theorem 2.26.4
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Theorem 2.26.4 is formulated as an exercise, but the last sentence just before it reads "so we give a full proof", suggesting otherwise. I think a theorem is better here, as it would be a hard exercise, even though it is prepared by Exc. 2.17.12 (which is doable). BTW to avoid the formulation "each such factorization is equivalent" Thm. 2.26.4, I would propose defining the type of factorizations and prove that it is contractible. Perhaps also rephrase Exc. 2.17.12 in this sense.
I agree that we should define (in symbols) the type of factorizations the first time this is needed, in 2.17.12. Then we can be less precise later on.
Done, see 25d93b7
However, working on this I changed my view on Thm. 2.26.4: it is premature, 0-connected and 0-trucated are not defined, and everything is done better in 3.9, Higher images. Hence my proposal is to delete Thm. 2.26.4.
I swapped 2.26 and 2.27, since the old 2.26 mentioned general
Done!