Just naturally makes a central run as that’s the space to run into when Saka initially turns, and Foden is more central to start off with too. If he suddenly runs wide left instead, the passing angle isn’t on at all because he’d need to go otherside of Kounde.
Like I said before with Kane long term, you need him to be there and make those runs, so someone can stay wide when another player picks the ball up in areas where Saka got it.
All tiny details, but probably the difference at top club level with those players and international level. Probably for Man City, KDB does what Saka does, Haaland does what Foden does, and Foden is wider, and there’s also another winger wide which means not as many go towards the one on the ball without offering up space. Having someone for us who can get the ball in those areas and then not lose one from outwide is next evolution we need.