Why would you look at it as "replacing" which has such a negative connotation. Azzi will only be adding to the team. She will help give Nika and Lou breathers. Azzi is not the best perimeter defender (personally i give that to aubrey). However, Azzi doesn't need to be "the best". She needs to be damned good, which is is. She is a big guard and a good defensive rebounding guard. And she will open up the pain on the offensive end which is invaluable.
Coached say time and again that once you get to the elite 8/final 4 ALL teams play good defense. you have to be able to score in the presence of good defense to win it all. You know what Muffets first advice to Megan Duffy was? "you need to be able to score against them (UConn)." The top teams all have great defense (SC, Stanford, UConn). Azzi will be a good defender, and a GREAT offensive threat. That is not "replacing" anything, only adding to the team making us stronger.