Workflow and Team configuration

Hello ARAS community,

one time again i would be gracefull to advise me ^^.

1/my workflow is driven by teams.

i have build a vote step like this : 

Reject check and check are voting activity with as Managed By, Role and Assignment this team "alex_team".

When i am at this step every user in the team will have the task (in basket task) to check or reject check.

I need that everyone has voted before closing the activity.

Problem if i delete someone from the team he still has the task in his basket...

So the activity is never close and the workflow is stopped. Any idea about the configuration ?

Thank you so much :)