Years ago I was moved to a role in the Exchange email team. That increased the size of that team from two to three. I was a team leader at the time of the move, though I had no team to lead. In the Exchange team I was still at the team leader level, but so were the other two guys and they had YEARS more experience of supporting and working with Exchange (5.5) than I did.
You can imagine then that my opportunities to 'team lead' were basically non-existent. How do I lead a team in which nobody was a junior?
I got marked down in my end-of-year review for not showing Team Leadership.