Mauricio Pochettino emphasizes the need for maturity and competitiveness in team. He believes experience is not necessary to create these strengths. Pochettino stresses the importance of building a competitive team that supports each other. Experienced players like Thiago Silva and Raheem Sterling are crucial in guiding young players. Young leaders like Reece James and Conor Gallagher are expected to grow into leadership roles. Pochettino highlights the potential for new players to become leaders as they establish themselves at Chelsea.