Ann: Update on PharmAust Canine Cancer Trials, page-63

TC Zolvix as a stand alone drench is not wildly used in agriculture as many of the target worms have become resistant to it through over/ improper use hence the development of Zolvx Plus. It is not best practice to use drenches as a preventive for that reason. 100% worm kill when drenching is almost impossible to achieve, the ones that survive build resistance. There are ways and means to avoid resistance by paddock rotation, alternating drenches etc.
I am pretty sure Zolvix does not kill tapeworm which is the main concern in dogs namely Hydatid Tapeworm.
On a molecular level I don't know about any of the above.
As to the rest of your musing, the same!