JT Miller

Retain 50% on Miller and replace Dermott with a 2nd

i'd do that

Leafs don't have the cap for Miller...even with retention. Why do we see so many Leaf trades trading Dmen? Leafs only have seven NHL competent Dmen. They can't trade one without getting one in return (and then what would be the point)

I think you are seeing posts like that because NHL insiders have basically confirmed the Leafs are shopping Holl and Dermott

NHL insiders? Reporters that start rumours, so people think they are "insiders". Oh I don't object to Holl and Dermot being traded (or any Leaf) but as I said, unless the Leafs get an NHL Dman in return, Holl and Dermot won't/can't be traded.
For some reason on CapFriendly, there is belief that virtually all Leaf Dmen are poor, and other teams bottom enders are so much more superior.