assisting in a reduction of simultaneous block finds.
Having two different algorithms doesn't reduce simultaneous block finds, only making blocks further apart does.
I think you misunderstand what I was getting at ... it reduces the chance that a single source can find 2 blocks in a row ... makes the 51% issue maybe a 75% or more issue or whatever the stats would be.
You misunderstand 51% attack (like many other things). With 51% (technically 50% + 1 hash per second) you will eventually have the longest chain., that is a mathematical certainty.
Instead of attacker buying x CPUs or y GPUs he will now simply buy 1/2x CPUs and 1/2y GPUs.