The other group of theories referred to by Massey can be categorised as dealing in their entirety with the actual redaction of the Qur’ānic corpus. They hold that the Muqaṭṭa’āt are an integral part of the original codex, but peripheral to the revelation itself.
We have already examined Bauer’s catchword theory, but he also maintained, as have many other scholars, that the Muqaṭṭa’āt were critical to the chapter order and that they therefore influenced the final structure of the corpus.
Loth and Scwalley’s earlier contribution to Bauer’s theory maintained the central proposition of the Muqaṭṭa’āt being integral to the text, convinced by the arrangement of the chapters prefixed by the same letters containing similar information. Unfortunately, no explanation as to the Muqaṭṭa’āt prefixing single chapters was made as these single letters proved impossible to rationalise.
Bell, in his ‘Introduction to the Koran’, saw both the letters and the Basmallah as integral to the original corpus, maintaining that the Muqaṭṭa’āt were early Medinan revisions adapting chapters for inclusion in the final corpus.
The most contemporary redactional theory confirms that the chapters are not arranged from the longest to the shortest even with the exclusion of chapters 1, 113 and 114, and hence ‘exceptions’ were made for the decreasing-length ordering of chapters beginning with the Muqaṭṭa’āt.
Neal Robinson has expressed reservations with this theory. He demonstrates that there are exceptions to this decreasing-length order even if the chapters commencing with the Muqaṭṭa’āt are taken into account. He also points out that not all the chapters beginning with the same letters are arranged together.
Instead, he suggests that other factors including the repetition of key words and phrases in consecutive chapters were taken into account by the corpus redactors. Indeed, this appears to be the crux of the argument: if some concrete link could be established between chapters prefixed by the same Muqaṭṭa’āt, it would only leave us with the explanation of the letters heading only one sūrah to investigate. Nevertheless, the redactional theory of the origin of the Muqaṭṭa’āt still does not explain their placement above these particular 29 chapters and not others.
 Massey, ‘Mysterious Letters’ op. cit., p.473.
 Welch, op. cit., p.413.
 Ibid., pp.413-414.
 Richard Bell. 1970. Bell’s Introduction to the Quran – Revised by W. Montgomery Watt. Edinburgh: Edinburgh University Press. pp.63-64.
 Massey, ‘Mysterious Letters’ op. cit., p.474.
 Neal Robinson. 2004. Discovering the Qur’an: a contemporary approach to a veiled text. Washington: Georgetown University Press. pp.260-270.