I don't know about Cassiopeia; she seemed like the weakest link in the list of possible starters to me.
Posts from Is there a need for a HotA tournament?
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Is a tournament needed?
If you participate, what's the point of playing in tournaments on SoD?
The problem starts in "not her own" scenarios, where one careless move or bad morale can result in losing half a stack. Also, you can't take nymphs into Dragon Utopia-hives, nor into many ГО either.
Which of these outweighs the other requires tests in real games; it is difficult to evaluate this mentally.
In my tests for Jebs, Corkes showed the best results — he starts off mediocrely, but as he gathers 6-7lvl caches and canned meat (which is even more convenient for him to carry through swamps) and levels up, he quickly becomes a beast.
However, these were tests from a time when zephyrs and workshops didn't exist yet. With them, Cassiopeia's position definitely improves.