How Narvik shaped Bismarck's missing destroyer screen

How might destroyer support have changed Bismarck's sortie?

Surviving German destroyers could have created a stronger screened task force, but losses around Narvik meant that support was unavailable.

German destroyer losses around Narvik left Bismarck without a stronger screen. Surviving escorts could have produced a much stronger German task force and changed the terms of the operation. That possibility concerns force composition and does not imply that destroyers would have guaranteed Bismarck's escape.