I wouldn't bet on that guess. 'Cause I don't make sure to lose bets
As for the "saturation and bustle of speech", you are not the first to notice this, and you are right. I got the impression that initially the whole storyline, dialogue and character development for Kate's storyline was done by someone else until about version 0.29, and DS did Max's line. It may not be true, of course, but that's how it feels. Then something happened and DS started doing Kate's storyline too. And if you start the game for Kate from the beginning, then the difference is simply immediately visible between then and now.