Deidara did admit to be weaker didn't he?
i personally think deidara overrated sasori powers c4 gets into everything living it would enter sasori heart and tear it to pieces
They both are long range fighter so that would be hard especially since Sasori most likely knows about Deidara's moves but still could be
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And one thing... for those who say Deidara can bomb Sasori's puppet... you really fking think he has enough clay for 298 puppets?
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Don't forget that one scratch and Sasori wins...