With Jen Li, the number of possible players decreases by a few with each round. It's more complicated with Cain; he has immunity to block and isolation. We might have to wait a long time before there's an acceptable number of players left for him.
The author-work connection is actually quite a good clue. It's not like a film-actor, where you can have a ton of actors or films. I like the Shaman clue more than the Alex clue.
However, I think the Mafia will target each other.
And, by the way, there's only one argument for Shaman – the clue. Which you also criticized, attributing it to Alex.
And even if you were absolutely right, it would still make more sense to eliminate Alex.
Added 1 minute ago
and also earned a plus to suspicion...
There are two buttons to the left of "quote" for that