Billy is the most recast Y&R character and suffers for it.
David Tom (twice) Ryan Brown,Billy Miller,Burgess Jenkins and Jason Thompson all played Billy and this in addition to all the writer changes have contributed to the destruction of the character.
In that time only Phyllis has been recast and is back to Stafford. And Victoria (and that character changed with Heinle))
So all the other actors are the same faces and that helps a lot with going along with some of their characters 180's.
Logan is a very compelling character as he has such a rigid and damning moral code, yet his self-righteousness does not dominate him or feel like hypocrisy. I always think of those scenes where Winter was dying, and she begged him to tell her that he loved her. That was her dying wish, but, because of her actions and because of his honesty to a fault, he couldn't bring himself to say it, even as he watched her die.