You disagree with what? That they need more people to get better results? Maybe they do only need two people, but they need to be the right two people and with all due respect to the two people that have worked on it since GT4, it seems clear they are not up to the task.
GTS AI was not any faster outright than GT6 and exhibited the same bad behaviours. The only reason it was better is because they got rid of many of the really bad rubberbanding elements that saw cars slow down on purpose to let you catch up, or vice versa. They still brake way too early. They still brake mid corner. They still have poor situational awareness. They're still mostly docile.
Likewise, the same traits remain in what we've seen of GT7, I've seen no obvious big step forward. They probably will be better, but only by a small amount at best from what we've seen so far.
There were only two photographers, the rest are software developers. Look again.
So the point remains. They threw a huge team at Scapes to get it right because Kaz clearly cares a lot about it, but they've never shown the same enthusiasm or interest in AI in the last, well, 25 years basically. It's always been one or two guys, and it's always been mostly poor. Something has to change massively for it to change massively, either hiring a bunch of new people or just replacing the current 1/2 with people more up to the task.