The postulate "Every team has someone who at the bottom of its bell curve: an individual who has a hard time keeping up with other team members." is a misconception.
Knowing less or having less experience does not tell anything about intelligence or level of idiocy.
Handling newbies, noobs or laggards is an other matter though.
But be careful and contain your own arrogance or ignorance before judging someone else for being stupid.
The project, team or management is more likely to be the actual problem.
Is the documentation ok, is there any at all?
Do you have a program for enrolling new team members or do you just let everybody in?
Remember the golden rule.
When you point at someone, three fingers are ( usually ) pointing back at yourself.
