Wright started the 1st game Nunez didn't that's all we know. I believe the reasons behind that decision are unknown, unless you have additional information I don't. In which case please share ? I wouldn't have sacked Farke nor Wagner, but we are where we are.
So you drew a conclusion from the very limited information you had that Manning thought Wright was better than Nunez even though Manning has never publicly expressed that view. There could be a 101 other reasons why he made his decision including your assumption, but the truth is you don't know why the decision was made.