AD is certainly worth being one of the players comprising 60% of the cap, zn.

Nobody has ever said otherwise.

The question on the table is how much of the Ram cap can affordably be devoted to just AD?

At what point does his salary start to be a net negative on overall team fortunes? Like maybe hampering ability to later retain Gurley, Joyner, Peters, and Goff, for example?

At SOME point that would happen (not could happen, but would happen). Identifying that point and not going beyond falls on the Ram brain trust.

And there is no shortage of different opinions on THAT topic.