It had been some time since he was alone...
It may not seem so, but it has.
Since the Tides really.
That long has passed.
...
After getting Eden and leaving to fight Denial, he got back to Layer 0, where you could say he spent some time alone, until he found Kael, but he didn't really consider it as being alone, since that period of time lasted too little. If we counted every time a human wasn't around him, there would just be no point.
And he spent a lot of time with Kael; he did have times where he was alone, but never fully. Then came the arena, where again, you could argue he was alone, but at the same time, he had many people with him. Just that none were on his side necessarily; they were neutral.
