Delta data from multiprovider to OHT

hi,

I have a requirement where there are four infocubes (having similar structure) and I need to send data from these to an Open hub table .

We are using BW 7.3 , so if I use a multiprovider and DTP to send the data from four cubes to open hub table, Will this multiprovider support Delta functionality?
If yes,

1.If we have to correct some records of one cube, then how will delta and data from other cubes to Multiprovider be handled?

2.Next, What are the pros and cons of using this approach?

Also, We have large amount of data being sent from each cube (weekly 3,000,000 records per cube - note this is a weekly load) , so would it be a better approach to have one transformation/one DTP for each cube directly to open hub,  rather than going with multiprovider approach ?

Thanks,

Richa