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Energy is not the question in this case but yeah, I think you're right. The bike slows down through backwards force from the tyre on the ground. That force must pass through to the axle to slow the frame/rider and therefore must always be transmitted through the spokes. Torque/force at the tyre at the point of skidding is always the same thus stress on spokes is always the same.
frankenbike
And all the other braking forces required to turn kinetic energy into heat get magically turned into pixie dust? The mechanical advantage of the braking system varies between disc and rim brakes. The kinetic energy which needs to be transferred into heat does not. Unless your rims are connected to your hubs via magic pixie dust or unicorn hair, all that energy transfer has to take place via the spokes.