Team creation will not impact your start time window. To guarantee that you receive the same start time window as your teammates, all members of your group must book the same 1 hour start time window.
To ensure that all members of your group receive the same start time, one person from your team can register the entire group (up to 10) for the same start time window during a single checkout as long as there is enough availability in that start time window for the entirety of the group.
Participants with different start time windows on the same team will not receive the same start time. If members of your team currently have a different start time, they can change their start time via MyEvents based on availability.