Hi Surya,
There is not much difference as the std cube is fetching data daily.
Only purpose that the virtual cube can serve here is for reconciliation of data between BW and ECC systems.
If you don't want to go for reconciliation, you can remove the virtual cube from your multiprovider.
P.S: Queries based on this MP use Access method to identify from which cube the data is coming and both can be compared (Replicated data or Direct data)
Thanks,
Akanksha