The troops types in this game are not a good reference, some are like classes while others are just the race. For example Goblin Rocket is a construct, but what/who is the troop? The Goblin or the Rocket? @Cell could probably add a line in Gobby’s adventures where he doesn’t knows if he is a person or the rocket himself. A figurative way to show that in a goblin society, (war driven society) he is recognized for what he does and not for who he is…
It’s not like as if we can have a Mechanist counting as construct that our hero just became a cyborg or a robot. I see it more like if his affinity/familiarity with those troops is really great to the point that his tactics fits well with his allies.
The Druid/Shaman class could have Feybond because the class channels the nature forces/energy to use at his will, as well as it could have Blessed because the natural magic is usually divine magic.
All of this from a RPG/Fantasy point of view.