Shining Armor is... mostly aware of what his little sister's been up to since the Friendship Games. Cadence keeps him in the loop, but she refuses to talk about some topics, insisting that it isn't her place to discuss them. When his phone rang a few moments ago, he thought Twilight had finally decided the time was right.
He's not entirely wrong, but he'll soon wish he had been.
An honorable mention in the Shining Armor is a Terrible Dad Competition.