Oherwydd y cyfyngiadau amser sydd wedi’u nodi mewn deddfwriaeth ar hyn o bryd, pe bai prif gyngor yn newid ei drefniadau gweithredol, efallai na fyddai modd i’r etholiadau am faer gael eu cynnal ar yr un pryd ag etholiad cyffredin i ethol cynghorwyr. Gallai cynnal etholiadau am faer yn fuan ar ôl (neu cyn) etholiad cyffredin darfu ar y prif gyngor a gallai ei ansefydlogi.
As a result of current time limitations set out in legislation, if a principal council changes its executive arrangements, mayoral elections may not be able to take place at the same time as an ordinary election of councilors. Holding mayoral elections shortly after (or before) an ordinary election could be disruptive and potentially destabilising within the principal council.