Perhaps a noob question, but what is stopping them from simply sharing the RB16 documents of the allowed parts Dropbox style? Saves money for RB and speeds up (literally) AT considerably. Maybe they can even then use AT as a roadblock around the pit windows against Mercedes/Ferrari when they get behind them because the AT is the considerably faster and thus in their pit window
Best WDC-drivers in F1 history:
Schumacher, Senna, Fangio
Driving a dominant car in the most dominant team ever, helped by favorable rule changes, against subtop teammates does not make you the GOAT (but still superb). It just helps you inflate/skew your stats.