Hello,
As a scrum master, I'm working with a Development team of 4 devs. The team has 2 junior devs and 1 senior DEV and 1 medior job.
The problem in my team is that team does not take scrum/agile values very seriously, it isn't wrong to say that they don't care too much about it. Besides the senior dev totally hates scrum and is always unhappy whenever invited to a meeting, my feeling that his behaviour is affecting other team members too.