Yes, I'm pretty sure the bonuses do stack. The reason spear_bonus_x always appers coupled with spear or light_spear is because if the two latter are not present, then spear_bonus_x has no effect. Btw, as the Guide also mentions, light_spear doesn't give +4, it gives +8, but contrary to 'spear', it gives that to defense.
No I don't think CA ever made a comment on that. The numbers in the Guide are results of long months of hard testing.
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