I think I've answered that. The issues management staff is responsible for helping prepare the Prime Minister to participate in question period. In that respect, their role is no different from that of prime ministers' offices in previous ministries. They help to prepare other ministers. They work with the staff of other ministers to help ensure other ministers are prepared for question period.
Questions are raised and accountability is expected, not just during question period when the House of Commons is sitting, but at all times, every day, 52 weeks of the year, seven days of the week, 24 hours a day. They may be asked by a reporter, a stakeholder, or otherwise. So they perform a similar function when the House of Commons is not sitting and there is no question period. They prepare and assist the Prime Minister to answer questions, or work with the staff of ministers to ensure they are prepared to answer questions about what is usually au courant, or topical.