"Imagine the Swan"

I've noted before that, as the Zombie Heaven liner notes point out, the harpsichord at the beginning of "Imagine the Swan" arpeggiates chords in the same manner as Bach's C major prelude from the Well-Tempered Clavier (BWV 846).  I recently printed out the notation for the prelude because I want to learn to play it (or try to, at least), and I noticed a couple things.

In the C major prelude, the initial two notes in each arpeggiation are held underneath the other notes:

I don't think Argent follows this in "Imagine the Swan."  It sounds like only the initial note is held, but only for the duration of the second note and only in the two introductory measures.  The rhythm is scaled down too, so it's something like:

As a bonus track on one of my editions of Odessey and Oracle, there's a mix where this harpsichord part is doubled on organ, and the organ certainly doesn't hold that initial note for the duration of the whole arpeggiation.  It plays all of the notes with equal values.

In the Zombie Heaven liner notes, Argent explains that "Imagine the Swan" uses "Chris' chord sequence but we did it like [the Bach prelude]."  Adjusted for key, though, the first two chords are the same... sort of.  The Bach prelude is in C major and arpeggiates a C major and then a D minor; "Imagine the Swan" is in F major and arpeggiates an F major and then a G minor.  Both have the tonic chord (I) and then the supertonic (ii), but the arpeggiations of the supertonic chords differ.  Bach puts a C note under his D minor and skips over an F (C D A D F), but Argent plays a regular old triad with some notes repeated higher (G Bb D G Bb).