A funny thing I've noticed is that Psionic Wand (Dragon exp) had the same ability as the Leywalker, but it's a Weapon and normally you don't use other Weapons together. The Warrior and Dervish are the only ones who could, but they don't need it; they could have raised the question when in psychic combat with Exorcist's Blade and another Weapon used in psychic combat. Nevertheless, nobody ever asked if he could first calculate the total Craft derived from Objects/Followers and then add also Strength derived from Objects/Followers.
I think people would have agreed on Rigmaster's interpretation of "Craft value, Craft counters, and general Craft boosts=Strength, plus combat boosts to "Strength in battle", only in reverse, naturally. At least I hope so, as I feel it is the simplest and most natural explanation, that allows players to utilise the greatest number of boosts, which I think most players of Talisman find fun. After all, a big part of Talisman is collecting an enormous arsenal of modifiers!