Question about quitclaim vs and/or assigns

[Larry Bly]

I am looking at investing with two partners and have discussed this arrangement with a lawyer. The lawyer recommended we make offers and sign the purchase agreement with "and/or assigns". Once accepted we would be able to just set up the LLC with knowledge of the whole picture as far as amount invested and percentage etc, and close with the LLC. She says this is easy and won't be a problem, just give her a call once we have had an offer accepted and the process will be done by the time escrow is closing. We are getting pre-approved now and talking to a mortgage broker it sounds like they're pushing towards doing a quitclaim because they're asking if we're ok with holding off on putting the property in the LLC until after closing. Any insight as to what's going on here? Maybe I'm just misunderstanding something...