Ryssovass question

So the group im running a game for is doing mostly an Iosan and Nyss group with a few others (this whole nig thing on fabricating souls is a character arc) and we are just getting started. One player wanted to make a Ryssovass as a bodyguard for another character and I thought it sounded like a great idea. But reading the archetype im wondering if it makes more sense for him to go strength based or dexterity. It almost seems like it really wants dex but then why the armor training?