My instincts tell me that centralising power in an individual is a mistake. Broadly speaking power needs to be distributed rather concentrated. It needs to be left where many people can find it and use it rather than given to a heroic leadership figure.
But, there is a fair chance that a Mayor for Leeds will come marching over that hill. So it seem sensible to think about what kind of mayor and what kind of policies, plans and strategies we might like him/her/it to pursue.