Considering that a UX designer is often required to carry out different roles within a UX team, does it also imply that a UX designer need to play multiple team roles. I find this rather conflicting because generally people of complementary personalities/behaviour trait work best in a team environment, and if a UX designer has to fill multiple roles then it can be in conflict with their own personality. In a company where there is no UX lead or manager (just UX designers) do they normally fit into the role of having to 'lead' or 'coordinate' between design and development or do they just end up trying to fit into the development process. I don't think that UX designers can just be a cog in the development cycle/sprint, but generally someone with a strong personality tend to upset the balance in the team.
My experience with UX designer roles is that they tend to either fit into a sprint cycle (as part of a step/process) or that they provide a deliverable for a particular sprint. I haven't seen UX designer that define the sprint process because they usually have to work with the scrum master or development lead.
The question is, in a UX team of more than one (UX designer, developer and graphic designer) and no lead role assigned, is it better for the UX designer to take the lead or step back?
As a side question, it would be interesting to see what types of personalities people observe with UX designers that they have come across.