Could small fast carriers guide battlecruiser hunter groups?

Would small fast carriers have been useful with battlecruiser hunter groups between 1915 and 1920?

Yes, aircraft could scout and spot gunfire, but a larger fast carrier would usually be the more efficient design.

Aircraft available in 1915-1920 could extend reconnaissance and spot the fall of shot for a battlecruiser group. Air defence was also possible, although the absence of radar direction made interception depend heavily on being in the right place at the right time. The likely number of battlecruiser formations would tend to favour pairing a larger fast carrier with each group. A longer hull helps speed through its length-to-beam ratio. Larger machinery also occupies a smaller proportion of the ship and its construction cost, making a large fast carrier easier to justify than a small one.