Explanation
The business analyst's responsibilities during the analyze phase of the Salesforce implementation lifecycle are to gather business requirements, create process maps, and write user stories. These activities help the business analyst understand the current state, future state, and gaps of the business processes and translate them into clear and actionable requirements for the solution design and development teams. Completing testing, building training materials, and eliciting requirements for the next iteration are responsibilities during the validate phase of the Salesforce implementation lifecycle. Creating a data dictionary, writing end user documentation, and reviewing test scripts are responsibilities during the prepare phase of the Salesforce implementation lifecycle.
References:
https://trailhead.salesforce.com/content/learn/modules/business-analysis-for-salesforce-projects/understand-the-s
https://trailhead.salesforce.com/content/learn/modules/business-analysis-for-salesforce-projects/analyze-business

Explanation
The best practice for giving all team members access and visibility to the most recent user stories as the project is in motion is to define a common repository to hold all user stories and track changes over time. A common repository is a centralized location where all user stories are stored and managed. It allows all team members to access, view, edit, comment, prioritize, assign, and update user stories as needed. It also tracks changes over time and provides version control and history of user stories. A common repository can be a tool such as Jira, Trello, Asana, or Salesforce Agile Accelerator.
References:https://trailhead.salesforce.com/en/content/learn/modules/business-analysis-user-stories/manage-user

Explanation
This answer states that conducting elicitation with stakeholders regarding their parts of the process is what the BA should do to close the gaps or confirm the process steps after conducting a group workshop with stakeholders to understand and document in-scope business processes. Elicitation is a technique that involves asking questions, gathering information, or observing behaviors to understand the needs, expectations, and goals of the stakeholders or users. Conducting elicitation with stakeholders can help the BA to clarify any ambiguities, resolve any conflicts, verify any assumptions, and validate any information regarding their parts of the process. References:
https://trailhead.salesforce.com/en/content/learn/modules/salesforce-business-analyst-quick-look/use-stakeholder

One thing that user stories help the business analyst do is encourage iterative development. Iterative development is an approach that breaks down a project into smaller cycles or iterations, each delivering a working piece of functionality or value to the user. User stories are well suited for iterative development because they are concise, focused, and prioritized based on user needs and value. User stories help to deliver features faster and more frequently, while allowing for feedback and changes along the way. References:
https://trailhead.salesforce.com/content/learn/modules/user-story-creation/learn-about-user-stories