Ca firm will get 10 years.
Rotation is applicable if 2 terms of 5 years are over.
One year term of first auditor or short term of causal vacancy auditor will not be counted.
But sir if sec 139(2) not applicable then the same Auditor can be reappointed by simple ratification
looking at query i assumed , that rotation is applicable and focus was on point weather first auditor can be reappointed, so answer is yes he can be reappointed and that too for full 10 years