Unless the codex changed it, BL is right. World Eaters are all berzerkers.
Possibly, you might work up some sort of reasonable justification for some of the Emperor's Children and World Eaters not to be Fearless. You'd have to start with some premise along the lines that they aren't all mindless slaves to experience or berzerkers, respectively. The thing is, though, as the most die-hard adherents to their deities' world views, they should be the best possible mortal embodiment of the deities' traits. Having some of them not follow the principals is going to be a bit of an uphill struggle.
Non-cult CSMs of similar loyalty could still be sane enough to function as normal CSMs. I suppose you could have a "cult" list that was actually a core of the cult legion marines, with followers that were not as far gone. There is also the idea that even though the attrition rate among the legions may be low, they would have to indoctrinate new members eventually as they're not immortal and would have battlefield losses. The "normal" troops could be novitiates or new initiates to the cult legions.
I could most easily see some of the Death Guard being non-Fearless, as well as going with a "Cult + Follower" concept.
I don't see a way to get around TSons being Fearless. The Rubric troops are automatons. From a practical standpoing I tried several versions with the non-Rubric units like Sorcerers being non-Fearless and they just became hackdown fodder.
I don't even think the "Cult + Follower" idea works very well for them. Unlike the cult marines in the other legions, who may be exceptionally long-lived or have time-warp experiences in the EoT, the Rubric TSons are essentially immortal. Even if the original suits of armor were destroyed I could see them being recreated from mere fragments so that anything short of total disintegration means they can come back. The TSons would only need to recruit replacements for the still-mortal sorcerers. I picture most of the later additions to the Tzeentch cult being psykers seeking greater power and glory. At that point, they join a cabal of other sorcerers or find/rebuild some Rubric marines to command, or both.
The only mortal and non-sorcerer followers I can picture for Tzeentch would be Possessed. Even then, any non-sorcerer, non-rubric followers would be shortlived as they succumbed to rapid mutation.
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). That leaves the Death Guard and the World Eaters. I'm willing to consider that these two armies shouldn't be Fearless, but then which units should be and which units shouldn't? Do we make Bezerkers and Plague Marines Fearless like in 40K? Do we make all other troops not Fearless, again like 40K? I have issue with the idea that, say, Nurgle Chosen are less Fearless than the normal Plague Marines - what's going on with that? Then again, that's how it is now in 40K. 
