The author said L is the smartest because plot requires it so yet he rates his intelligence 8/10 same with Teru Mikami
and she puts Light at 9/10(he deserves it) shockingly he puts N to 9/10 who openly admitted his inferiority to L
and she puts Light at 9/10(he deserves it) shockingly he puts N to 9/10 who openly admitted his inferiority to L