They are all premiums.
Risk free is risk free return
Asset is weight of class in policy * asset return(Rc) - Rfr
Benchmark is misfit return adjusted for benchmark weights (Rb-Rc)
Investor is active return (Ra - Rb)
Allocation is transaction costs, policy weight differences, etc.
They should all sum and cancel each other out, to get to total return, which is end value/beg value - 1