I mean, I think they need to be cultural fits and have to actually play school and have been in good academic standing at their old school.
I don't think they're just going to take every Joe Schmo with credits in underwater basket-weaving.
That said, it definitely looks like the credit transition thing that was an issue for ND is no longer an issue. Riley Leonard, IIRC, didn't graduate from Duke before transferring to ND, and didn't get his degree from ND either when he left. However, the credits he earned at ND did help him finish his Duke degree.