Inconsistency betraying many writers including experienced ones

Consistency is, like teamwork in an organisation, providing the required connections of ideas in writing.

Shown below are the first two sentences of a paragraph taken from an article written by a professional writer in a popular national English daily.

How can a good client trust an agency that gives away free ideas instead of building their own agency brand? No client should engage an agency to guard his brand when it can't do the same for themselves.

In the first of the two adjoining sentences above, agency is a body treated in the plural form with the use of the plural pronoun their. However, the one following this has seen the inconsistent use of a singular pronoun it.

To be consistent, the two adjoining sentences should have been : How can a good client trust an agency that gives away free ideas instead of building their own agency brand? No client should engage an agency to guard his brand when they can't do the same for themselves.

Adversity brings knowledge, and knowledge brings wisdom.
-- Welsh Proverb


Here are wishes to all for a very happy and prosperous Chinese New Year.