The only non needed file is the USBLoader wad that modmii downloaded. It's a forwarder to many existing loaders, I personally don't like that channel. I prefer using the official channels/forwarders from the loader.
You can delete that wad from the folder before copying to your SD card.
You are using an old wad manager which still requires cIOS or IOS with vulnerability to install Wads.
You can use MultiModManager which uses another method to access the Wii internal file system.
I think MMM is the homebrew downloaded by modmii to install the downloaded files, so you will have it now. You can use this one instead of Wad manager 1.7