I think the relative difficulty of hacking AI(x-1) and AI(x-2) will be sensitive to how much emphasis you put on the “distribute AI(x-1) quickly” part. IE, if you rush it, you might make it worse, even if AI(x-1) has the potential to be more secure.
(Also, there is the “single point of failure” effect, though it seems unclear how large.)
I think the relative difficulty of hacking AI(x-1) and AI(x-2) will be sensitive to how much emphasis you put on the “distribute AI(x-1) quickly” part. IE, if you rush it, you might make it worse, even if AI(x-1) has the potential to be more secure. (Also, there is the “single point of failure” effect, though it seems unclear how large.)