I don't see any specific reason in article. Is it because of pandemic or what? Well whatever the reasons, its big blow to Windies team as both Bravo and Hetmeyer are good cricketers. Still 1 month to go so they have enough time to rethink, let's hope they change their decision.
Shimron Hetmyer Darren Bravo and Keemo Paul declined to tour England because of the number of corona cases and the number of people died and i can understand why they care about their health than playing the game. I do not think they can be back in the team as they will not be part of the preparation and without going through training i do not think they will be selected even if they want to return for the tour at a later time.