I love Mark's (Peter's) Greek.
Here's one example. Mark loved shorthand. This is especially true when it comes to pronouns. Often Mark uses the article when one might expect a pronoun. An example is Mark 7:11: "If a man says to the father or the mother." This, of course, means "If a man says to his father or his mother." Or take 6:41: "He broke the loaves and proceeded to give them to the disciples." Whose disciples, you ask? His, of course!
So remember: Mark often uses the article to express the ideas of "his" or "their."
More coming ....