They strung together 10+laps on that final stint. Each time doing a hot lap, then cooling down, then going for it again.
People are killing these guys for not understanding tyres, or focusing on qualifying. Now you can visibly see them doing tyre runs, doing race prep, and people are worried about where aero appendages have gone?
0.5 seconds was the difference in Germany. In the space of a week, it becomes 1 second? Very, very unlikely.
I wouldn't be surprised to see both mercs in the top 10, maybe even 1 in the top 6.