I've always thought Norris has a title in him based on his outright speed but there were other parts of his overall package missing; he seems to have taken it to another level since the summer break though.
While he has clearly taken the pressure and been galvanised, Piastri for some reason hasn't coped with the pressure at all, he had a fairly poor final run in at the end of last year as well.
Piastri will get a title eventually although if Norris wins this season as seems likely now you wonder if he'll kick on next season and find another level again making Piastri's job harder, especially in a team that lets face it seems to favour Norris anyway.
In some respects I see parallels between McLaren with Norris and McLaren with Hamilton - someone they brought into the sport and supported in F2, etc getting favoured over drivers they've brought into the team.