Scenario Planner historical responses

Do the historical responses in the scenario planner have any input for the results. If these are not present in the Migrated Data in the BOE, do we still get good results in the Scenario Planner?

Please check the above image where all the responses in the Migration data is 0. Does this have any impact on the Reach and Responses results? I am wondering if this might be one of the reasons for the low reach and responses shown? Please clarify. Thanks.