Lean on me program
By the nature of your team, it may be that the team lead should be challenging the Lean Silver or Lean Gold Certification while other team members should be working on Lean Bronze Certification.
And, by mentoring others, team members help instill the culture of lean and help in the development of themselves and others. By asking for advice from other certified practitioners through the Lean Certification Alliance, you can get help in making sure you are moving in the right direction.