EXS006 Keep a Line Closed
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In the subject lesson:
http://www.chess.com/chessmentor/view_lesson?id=7068
in which the idea is not to allow black c5 thus keeping the a8-h1 diagonal closed, the discussion says that after while moves c5 that Bb7 is relegated to the role of a pawn. I understand the main idea, but why can't black go a5 allowing a subsequent Ba6 and bishop becomes more active?