From "The Image says: 'A mat of white cogon grass'" to "nothing is not advantageous." The Correct Meaning says: As for "a withered willow sprouts shoots," "withered" means dried up; "shoots" refers to "the flowering growth of the willow."
Nine in the Second Place, being yang in a yin position, can exceed its proper allotment to rescue what is feeble and declining.
Having no correlate above, its heart harbors no selfish reservation; dwelling in the time of Preponderance of the Great, being able to practice this path, there is no declining entity that is not rescued.
Thus what was declining flourishes anew, just as a dried-up willow sprouts vigorous young shoots, or an aged husband takes a young maiden to wife.
"Nothing is not advantageous" means that in rescuing the weak and reviving the declining, nothing surpasses this; acting according to this, there is nothing that is not advantageous.
On the commentary from "'Ti' is the flowering shoot of the willow" to "corresponds to this principle": The Correct Meaning says: "Ti" is the spike of the willow, hence called "the flowering shoot of the willow."
"Being yang in a yin position, it can exceed its root and rescue its weakness": if yang occupied a yang position, it would abide by its normal allotment; now yang occupies a yin position, which is exceeding its normal allotment to rescue the yin weakness.
"When age exceeds, it withers; when youth exceeds, it is tender": an excess of age leads to withering; an excess of youth leads to tenderness.
"When the old shares with the young, the tender grows" means the old husband yields of his age to the young wife, and the young wife receiving it matures further, hence saying "when the old shares with the young, the tender grows."
"When the young shares with the old, the withered flourishes" means the young wife shares her youth with the old husband, and the old husband receiving it is like a withered branch sprouting fresh shoots, hence saying "the withered flourishes."
As for "in Preponderance of the Great, the situation is in utmost decline while oneself is in utmost vigor; using utmost vigor to assist utmost decline corresponds to this principle": this hexagram Preponderance of the Great fundamentally illuminates utmost vigor assisting utmost decline, rather than utmost decline diminishing utmost vigor.
Therefore Fusi's commentary specifically notes "using utmost vigor to assist utmost decline."
As for "The Image says: 'Exceeding to associate with each other,'" because utmost vigor assists utmost decline, resembling a young wife aiding an old husband, it consequently speaks of the old husband yielding age to the young, as if utmost decline yielded decline to the vigorous.
In reality, it is not so.