Harry Potter, Endings Sequence

So, since everyone's talking Potter and book 7 speculations these days, here's a little one:

Notice that each book has Harry bring a different set of people in to the final action/confrontation sequence? (Usually he's by himself at the end, but I'm talking about who's there at the start of the big finish.)

Book 1: Ron and Hermione both accompany him into the stone's hiding place.

Book 2: Only Ron is with him going into the Chamber.

Book 3: Only Hermionie is with him in the time-travel sequence.

Book 4, the center book: He's alone (or accompanied by his rival Cedric, if you start the 'final sequence' a bit earlier.)

Book 5: His entire extended peer group show up at the ministry.

Book 6: He's with his mentor Dumbledore.

So, each time it's been painstakingly different groups. My guess for book 7, to fit this 'pattern'? When Harry heads into the final confrontation, he'll be surrounded by his (former?) enemies: Snape, Draco, Wormtail. And maybe even Dudley, too.