Tischendorf says canonicity of many NT books is not on the "same footing"

[Steven Avery]

Although in my work my main task was with the canon of the four Gospels; although I in no place undertook to put the whole New-Testament canon on the same footing, as, indeed, no thorough scholar can- do; and although I do not speak specifically of the whole canon, and merely put together as of equal canonicity the four Gospels, the Pauline Epistles, the first of John, and the first of Peter,

Origin of the Four Gospels (1867)
Tischendorf
https://archive.org/stream/originoffourgosp00tisc#page/10/search/footing
https://books.google.com/books?id=r1oHETeAq0UC&pg=PA11

Omitting as not on the same footing

2-3 John
2 Peter
James
Jude
Revelation

Acts (apparently)
Hebrews (unclear, depends on whether thought of as Pauline)

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There is a lot of confusion in the Tischendorf writings:
https://archive.org/stream/originoffourgosp00tisc#page/214/
https://archive.org/stream/originoffourgosp00tisc#page/286/ - note on p. 214