From 'The Commentary on the Judgment says: Dispersion: prosperity' to 'joins with what is above': The Correct Meaning states: 'Dispersion: prosperity' repeats the text of the classic, briefly citing the name and virtue.
'The firm comes without exhaustion; the yielding attains its position outside and joins with what is above': this explains why it can disperse perils and difficulties to achieve prosperity, reaching 'advantageous to cross the great river, advantageous to persevere,' based on Nine in the Second Place's firm virtue dwelling in danger and Six in the Fourth Place attaining its position to follow the ruler above.
Two, with firm virtue, comes to dwell in danger without being exhausted by it; Four, with yielding compliance, attains its position outside and joins upward with Five. Firmness within brings no distress of perilous entrapment; yieldingness without brings no discord of rebellion.
Therefore it can disperse perils, achieve prosperity, establish ancestral temples to offer sacrifices, cross the great river with success, and employ the correct way to gather the people.
On the commentary 'Whenever firmness can expand' to 'advantage in persevering': The Correct Meaning states: 'Whenever firmness can expand without the burden of fearful compromise' refers back to Nine in the Second Place dwelling in danger without exhaustion, which means firmness expands smoothly; once firmness expands, there is no longer any distress of fearful hesitation or crookedness.
'Yieldingness treads in correctness while sharing purpose with firmness' refers back to Six in the Fourth Place attaining its proper position and sharing purpose with Five.
If firm virtue did not expand and yieldingness did not join with firmness, how could prosperity be attained to cross difficulties, with advantage in persevering without depravity?
Hence it says: 'then all enjoy prosperity, advantage in crossing the great river, and advantage in persevering.'
The commentary uses 'all' here for two reasons: first, though the Commentary on the Judgment repeats 'Dispersion: prosperity' and explains it with 'the firm comes without exhaustion; the yielding attains its position outside and joins with what is above,' below it separately states 'the king approaches his ancestral temple; the king is in the center; advantageous to cross the great river; riding wood brings success,' so one might fear that 'the firm comes' only explains prosperity and does not apply below; second, former scholars used 'the firm comes without exhaustion' to explain prosperity, and 'the yielding attains its position outside' to explain advantage in persevering, hence 'all' is used to connect them, making clear that both firmness and yieldingness explain everything from 'prosperity' down to 'advantageous to persevere.'
The Correct Meaning states: This re-clarifies the meaning of having an ancestral temple in a time of dispersion. When perils and difficulties are not yet leveled, one labors in planning; now being in the midst of dispersion, one arrives at having an ancestral temple.
From 'Advantageous to cross' to 'brings success': The Correct Meaning states: This re-clarifies the matter of using dispersion to overcome difficulties.
Riding wood to cross a river, one will never drown; using dispersion to cross difficulties, one will surely achieve success, hence 'riding wood brings success.'
On the commentary 'Riding on wood' to 'surely achieve success': The Correct Meaning states: Former scholars all regarded this hexagram with Kǎn below and Xùn above as the image of riding wood on water to cross a river, hence saying 'riding wood brings success.'
Wang Bi does not rely on the physical image, but directly takes its metaphorical meaning, hence stating this in sequence.