Why destroyers are bought as flotillas

How would a Royal Canadian Navy purchase of British destroyers likely be organized?

It would normally be built around full flotillas with a leader and compatible destroyers, not a collection of isolated individual ships.

A destroyer purchase is a force-organization problem rather than a shopping list of individual hulls. A flotilla needs enough compatible ships and a leader to train, deploy, and fight as one unit. Shared characteristics simplify tactical coordination and maintenance across the formation. That logic helps explain why hypothetical Canadian purchases would be structured in groups rather than scattered one-off acquisitions.