The ??? were at the "needs to be direct"
We've never used direct port on any of our enignes (although we have had a 6 port kit installed on a couple) once the single fogger was tuned correctly we found no need for the 6 port systems and pulled them off.
For the average RB engine looking for 75-125whp a single fogger is great.
For bigger hits tuned for ultimate performance multi port is the way to go I agree.