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Force Sword/Orb undoubtedly would have been Autonomous if it had existed then. As it is, they are similar, but not the same as Autonomous, which gives rise to some peculiarities such as this.
I hope to see an official ruling that agree with you. It will make more sense to me.
just don't interpret such things, it is not autonomous and therefore it works with the ring. There is nothing strange about it.
Any condition doesnt alter it, anything else that does give incapacitated or restrained doesnt alter it either. A grappler that has force orb can still apply.
Long story short the defense can always be used even if restrained (no - effect or incapactitaed)
and there is no reason it gets no bonus from the ring.
The card doesnt say condition MARKER, but condition, so everything that will give the creature the condition of incapacitated, restrained and likewise will not alter the defense