Every situation is different, but the concept of team-mates where one will run as a wingman while the other wins is largely an illusion.
When you're growing up, you see the term 'team-mate' and assume they are genuinely working as a team. It's not until you start to become involved in racing that you realise a team-mate is often your biggest rival. A lot of the collaboration is forced, though it means different things in different teams.
When Jim Clark was asked in 1967 what it was like being Graham Hill's team-mate at Lotus, he said, 'No, Graham is my team-mate.' We know that Nelson Piquet would not have Ayrton Senna in the Brabham team. The idea that a team-mate really means he's your enemy is one that's been alive and well for a long time. Denny Hulme didn't always confide everything to Jody Scheckter about which gears he should be running at different circuits. It's nothing new.