Caporegime
The team ordered them not to race after the mid 40's which effectively gifted Piastri the win. If Piastri wasn't his team mate then Norris would've been allowed to undercut him or go long, and with the pace he showed in the final stint he likely would've won. Piastri is a good driver but he's just not on the same level as Norris yet.
Piastri was ahead because he was faster than Norris right up to the last stint. Norris was only ahead because McLaren gave it to him rather than look after Piastri's race. Norris was apparently faster in the last stint but then Piastri was obeying team instructions to nurse the tyres and Norris was ignoring them so I think it foolish to read anything into that.
If Norris won that really would have been gifted.
And the WDC is over. Norris is not going to get close to Max.