Not sure there is such a title or role even in the new Constitutional dispensation..

the title may change may be to leader of minority but i believe the role is the same,

Is Ababu still in the house, Kalonzo and Muthama IMHO might not command the respect from cord members considering that the come from a minority party in the coalition in terms of no of MPS,

Dont forget depending on how the holder handles this it could propel one to greater heights in politics so competition is bound to be there