My bad, it's weapon skill 4 (making it the most elite dinosaur we have!). That was a very bad typo. I double checked the rest of the statline.
Absolutely, but it also seems close to mandatory, if it is to have a chance of gaining it's points worth in most situations, or maybe that would just be in my meta. (Granted the only time I used it were in an end times match where Karl Franz was on the field and he killed it in a single round of combat... so it has it's limitations against some of the most bonkers characters)
It's a bit of a rock-paper-scissors scenario. Against some army builds, the ethereal Dread Saurian build will be nearly unstoppable, while against others (say an army with access to magical cannons for instance) it will be picked off easily.