Formula One is different to other sports.
While the term "teammate" roughly translates as "partner" or "colleague" in football, for example, it is a synonym for "closest rival" in F1.
And unlike other sports institutions, Formula One teams—following the lifting of a ban on team orders in 2011—have the power to favour one of their employees over another.
The reasons for teams' decisions to do this vary from performance-related motives to ageism, with some team principals favouring the "next generation" for something as shallow as promotional purposes.
And although the morality of these steps may be called into question, it is undeniable that these inter-team wars create compelling sub-plots for Formula One.
There are some drivers, though, who for whatever reason—be it race results, qualifying performances or merely their stature—have failed to solidify their status as their team's prime focus so far this season.
We've listed those teams operating on equality here.