1) Voidwatch has nothing to do with TH. The only thing TH does in voidwatch is add additional lights across the entire spectrum if you fail to reach cap.
2) TH1 and 2 have never been proven to do different things. The strongest theory is that they actually do the same exact thing.
3) TH has been proven to not effect the quality of drops on multiple items that are 100% drops and share a slot.
4) Have I been trolled? Maybe.