I'm not positive so hopefully someone can correct me if I'm wrong on this.
Just no way to know until the details are released. There are many ways each aspect could be handled.
It would be trivial to borrow short term money from a big investment bank to fund a deal. The borrowing would be backed by the loans, so would be low cost money. Could also be a partnership with a big bank who assembles and funds the deal, as you suggested. Could have skin in the game or not.
One advantage to LC doing securitization rather than a bank is that then LC gets to keep the profit that would have gone to the bank. This business has been all about bank disintermediation, right? So why give banks a piece of the profit now?
There was a panel at lendit on securitization. All the panel members stressed how important it is for an originator to make everything look the way wall street is used to seeing it. Was funny. This just indicates the low level of intelligence among these institutional investors. If it has a CUSIP and I get a quote on bloomberg and it has a rating and it looks similar to other kinds of securitizations then I buy it. You and I didn't work that way! We learned about this new kind of asset, and learned how to choose what loans to invest in. I'm expecting that these new securitizations are all going to be broad index products, similar to what was done with mortgages in the past. I hope LC figures out how to earn a big markup from these guys.