Non Cumulative key figures in a cube with out initialization (2LIS_03_BX)

Dear Guru's,

I have a customized cube  for material movements .

This cube has 2 Key Figures with NON CUMULATIVE VALUE check box checked .

Also these info objects have the Non cumulative with Inflow & outflow maintained.

There is a daily delta being loaded to this cube by DS - 2LIS_03_BF.

I noticed to this there is NO  initialization done with 2LIS_03_BX .

Is it correct to do this way. It was done long back in 2009.

1). Now i am in the process of re designing the cubes ( load in to new set of cubes ) , If this is not correct can i just un check Non Cumulate KF in the info cube and change the info objects to cumulative?

2). If i leave it like this , there will be no use of aggregates & will habe performance issues isn't it.

Kindly guide me on this.

Thanks & regards,

Sudhir.