Difficult to Say

This summer has been a mish mash of advancements, disappointments, laughter and frustration.
Brogan has advanced to being able to answer "yes" and "no" questions with deadly accuracy. You never have to wonder if Brogan wants to do things anymore. He VERY loudly announces his intentions either way.
He played well with his cousins on a one on one basis but became aggressive when placed in a group situation and the other child's attention was deviated from what they were doing. It was like he couldn't handle the distraction. Or didn't like sharing the attention of the person he had picked to play with.
Being around his 9 cousins this summer really helped his vocabulary and sentence structure. He rarely uses "canned" sentences anymore. As we approached Jasper National Park Brogan had his head out the window taking in the beautiful vistas, then all of the sudden he let out an audible gasp and exclaimed, "Oh Mommy, look at that mountains!" Later that evening as I was setting up camp he asked, "Go for a walk in the woods, Mommy?"
He has a remarkable memory for peoples names. People he'd met last year only once and only for a few hours, he remembered their names - and where they lived. It's a bit weird, in a good way.
He's started writing the alphabet, along with words. His favorite words to write to date are Blue and Clue. Obviously from Blue's Clues. You can give him any arrangement of letters and he'll put them in order.
Bad things ... he has become OBSESSED with coloring. On everything. Walls, toys, couch, tables, mattresses. Every time I catch him at it or find him doing it I sternly remind him that the only thing we write on is PAPER. That, however, had not been effective. At all. So not impressed.
Since we've been home he's become his old, aggressive self. At the library unless I am sitting there, reminding him every other minute not to hit/push/kick he's a little maniac. I don't know if it's because he's become bored since returning home, if I'm not feeding him often enough, or ... if he's just naturally a bully. I hate the last option. So we're going to pretend that's not even viable.