I want to book a ticket EWR-EDI-EWR in YN for 100,000 miles. It's in the near future and there aren't any saver awards available in either class. Is this ticket upgradable with miles/cash or a combination of both? Is there a way to wait list for a saver BF award?
I did a little digging here about how CO handles wait lists and it seemed to me you had to be booked into saver economy to wait list for a saver BF award, but hopefully I am wrong.

Thanks for the guidance!