I noticed two problems with your answer. First, no scripture. Second, no purpose. When you speak of sufficiency we must ask what was the purpose of the atonement. It was sufficient to achieve it's purpose.

Sufficient
SUFFI'CIENT, a. [L. sufficiens.] Enough; equal to the end proposed; adequate to wants; competent; as provision sufficient for the family; water sufficient for the voyage; an army sufficient to defend the country.
1. Qualified; competent; possessing adequate talents or accomplishments; as a man sufficient for an office.
2. Fit; able; of competent power or ability.

I believe it was sufficient to save the elect, that being the purpose of Christ's death; a vicarious sacrifice. Scripture upholds this view.


God bless,

william