All these would use an MDD's resources just to idle. Each in succession will employ an alternate cpu.
If running only Logic with VSTs, only the first cpu will be employed. Thus a waste of the second cpu. You can loop the Node to thread to the second cpu, but the latency is very bad.
Run Bidule as a VST host.
Or, as a remote host machine, run 2 standalone instances of Bidule.The first launched will use the first cpu, the second launched will use the second cpu. But Bidule itself uses more resources than the standalone apps of those VSTs.
Even better to run 2 standalone Reaktor instances, for example.
Threading across cores on the MDD isn't implimented.
Of course in OS9 we don't have to be concerned with all this jive.