Gasly has been very inconsistent even last year. Terrible on his debut in Melbourne, great in Bahrain, nowhere in China, the list goes on...
Also, it's not the sole responsibilty of the engineers to set up the car, AFAIK the driver has something to do with it as well. Ricciardo may have been "unlucky" last year, but he was fast. Gasly so far is nowhere near where DR was last year.