Successful in secular subjects only - leave Yeshiva?

Igros Moshe (IV #36.14) Question: Those students who are not successful in their Torah study should they leave yeshiva and study secular subjects? Answer Are you claiming it is because of a lack of intelligence but they are intelligent for secular subjects? The fact is that concerning Torah anyone can improve with study even those who can’t study it in depth as long as they have a working memory. This is aslso considered growing in Torah and sometimes the ability of in depth study develops and it is possible to become great in Torah knowledge. It is not like medicine and other secular study where misunderstanding can result in harm. In fact the opposite is true. The ignorance in Torah can be harmful to his soul.