Non-Standard Marketing Attribution does not utilise persistence from eVars and Marketing Channel, utilising only the instance of each of these variables during the lookback window.  As such, there is a large "none" bucket for Marketing Channel, although Marketing Channel without using these non-standard attribution metrics does not contain a none - all channels are account for.  This is because the Marketing Channel Processing Rules sets channels based on what can or cannot overwrite previous channels.  
 
For example - if someone comes via PPC and then via Direct - if the PPC is outside your look back window, but the Direct is not, the non-standard attribution would give credit to "None" because Direct was not set-up to overwrite any other channel.  
 
Since the non-standard marketing attribution events ignores this persistent, it would be good to have an options for the following:
1. Follow the Marketing Channel persistence, ensuring the last "paid" channel continues to be given credit.
2. Follow current standards, BUT re-run the marketing channels rules to show what was the channel for each instance was, ensuring None shows the non-overwritable channels.
 
Thanks