That's not Seven.
He just had to look like Seven to get the job done.
The job of course being himself.
Although I'm not sure if he was driving himself crazy or driving himself sane.
There's good arguments for either side.
His mind fractured.
That's one of the brain shards and it talked the rest of him out of being such an asshole.
The day is saved.
Rudy never could have saved the day if he used his own rack.