Trade offers, Decline or accept? Advice?

Trade #2 - Santana Moss for Warrick Dunn is a do..........now u have 2 defenses u don't need to have both of them,and 2 kickers u don't need to have both of them either........pick up a wr with the spots u have left........but u are 7-0 so why change anything when its working 4 u...........