I just completed an act 1 play through with Sabille and Lohse as full Dex backstabbing rogues, Red as a heavy armour Geo/Hydro/Warfare tank utility, and Ifan as a dual wand Hydro/Aero heavy armour cleric.
Worked well. Red and Ibram took on tanking/offtanking duties with crowd control mixed in, using Telekinesis to drag targets behind them for Sabille and Lohse to safely shred a couple at a time, neither of them used sneak or invisibility during fights.
Moving forward into act 2 I could easily see myself spreading Lohse and Sabille into some schools of magic to give me access to increased utility spells, or even some warfare for the crowd control/mobility spells in there too.
