Could Tribal-class destroyers accompanying Hood and Prince of Wales have changed the Battle of the Denmark Strait?
Short answerThey could have kept up in the heavy sea and forced Bismarck to manoeuvre against a multi-axis torpedo attack, greatly complicating her gunnery and escape, though the outcome remains counterfactual.
NotesThe Tribals had often screened Hood and could maintain speed in weather that forced smaller destroyers to fall behind. A half-flotilla under Vian could divide so that torpedo spreads approached Bismarck from several bearings while British capital ships and cruisers continued firing. Even a few hits could slow the German battleship enough to make escape from Hood and Prince of Wales far less likely. This is a plausible tactical counterfactual rooted in escort doctrine and seakeeping, without proving that Hood certainly would have survived.