The argument over killing your subordinates, was anakin trying to claim that he cant think of a reason he would ever want to kill them? only to have obi wan point out, "Insubordination?" to show that yes, anakin WOULD in fact carve a bloody swath through his own underlings.
Foreshadowing. The one that immediately jumps to mind is in Empire where the SSD is brought out of hyperspace early against Vader's orders.
It didn't go well for the person who disobeyed Vader's order.
And even though the Comic Irregulars have been know to change parts of the plot, at the very least it's a Mythology Gag.