Couple of points:
Semantics perhaps but the correct title is Accountable Executive.
The F/O - Captain rated and considerably more experienced than the Captain flying the departure - during his walkaround saw critical surface ice contamination, most visibly on the rear empennage while boarding from R1.
When taking his seat in the cockpit he relayed that information to the Captain.
Prior to takeoff they were both heard on the CVR as seeing ice on the spoilers, which was part of the final surface contamination checks.