Vaughn missed her freshman year due to an ACL tear. Vaughn was ahead of Patterson in the rotation this year.
I think Patterson is more of a fluid athlete and may have more potential but she seemed to make more mental mistakes, which is why she didn't get more playing time the last couple years.
I will always remember Marina Mabrey grabbing her by the shoulders and physically re-positioning her on an out-of-bounds play during her freshman year.
I thought she was coming along ok and that the game had slowed down a little bit for her this year. In fact, she did win ND's "most improved" award at their awards ceremony.
So I think Vaughn was slightly ahead of Patterson in performance but Patterson was on track to catch up or surpass her next year.