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I assume that the first debt collector owns the debt, and has assigned collection authority to asecond debt collector for some reason.
There are multiple reasons why the owning debt collector may choose to use another assigned agent to conduct active collection, such as they might not be bonded to conduct business in your state of residence.
Pending, or even concluded, civil action based on violation of the harassment provisions of the FDCPA does not render the reporting of their collection invalid, and is not basis for requiring deletion of the reporting to the CRAs unless there is some provision in the court's ultimate civil judgment that orders the debt collector to delete all reporting. That is unlikely if the issue is their improper conduct of their debt collection activities rather than validity of the collection per se.
Reporting to all CRAs is totally optional, and deletion of reporting with one or more CRAs is not basis for requriing deletion with all.
The CRA to which they continue to report will not delete based on the fact that the debt collector has chosen to delete with another CRA.