No I feel that everyone has a different learning curve and that if they want to become a Team Leader faster, then in my opinion they see what we see in SFI or else they would not be reading as much.
They are the ones we should focus on, as the ambition is clearly showing and let them know we are there to answer any questions if they should need it as well as make sure to recognize their efforts.
This will let them know you see their efforts and are there for them.