The wiki page says:
Russell builds a prototype chromatic scale starting on the Lydian Tonic by stacking fifths, skipping the interval between the seventh and eighth tones. Using C as the Lydian Tonic yields the following 12-note scale with enharmonic respellings: C, G, D, A, E, B, F♯, G♯, D♯(E♭), A♯(B♭), E♯(F), B♯(C).
This makes sense to me - I can construct this same list of pitches myself by following the 'recipe' in the above quote.
However, when I looked in the actual George Russell book, the interval to the final note is different - I would have expected the last note to be F (following the sequence of fifths) not G♭
Can anyone explain that final G♭?