It's been a while since Walker was respecced, but I do remember the original concept was for him to be half fighting, half wood armory, and then I later dropped the fighting aspect to make better wood armory items. After respec, the stat priorities changed heavily, and I only thought about it recently, but they do not reflect his new priorities.

I made a test character to show what the difference between Walker and Spade are with no Iron Will, and the same Strength and Fortitude values. 20 HP is a lot! I'm not certain if this has been fixed after Walker was respecced, but it's probably not running the character creation calculation for derived stats after priority and trait change.