Your example is poor though. It's probably true that if Auba had played instead of Lewa we wouldn't have won 4-1.
The example doesn't matter, the facts does.
If people wanna make silly points without any context, facts can be played either way.
Aubameyang played zero minutes & we won 4-1, when he played we tied 0-0, undenial facts. Lol
But to your point, just for kicks
Lewa scored too goals that were setup by fati so
1) aubameyang could have scored those goals.
2) he could have scored other wise he possesses a different skill set to lewa.
Point is we don't know what could have happened, hence the "probably" in your statement.
Overall point is fati was the deciding factor in the game, not lewa, not Frankie de jong, no the absence of busquets.