Nail on the head. The gentleman who stated a single cam could be a fast as a duel/hybrid/binary canned bow needs to think of it in very simple terms... Imagine you rig up a pulley system to lift a 300 pound piece of furniture. Physics is not my area of expertise, but I guarantee you a 2 pulley system is more efficient & more powerful.
I suspect it is marginally "more efficient." However.....
I think the performance (single cam bow) is achieved by making that single cam eccentrics "twice as aggressive." (one cam doing the work of two) In that sense, it's quite easy to achieve comparable performance. But the problem that results from doing this is excessive wear on the lines. If you look at a 340 ibo single cam bow (they do exist, and I have one) after shooting it for 1000 shots or so..... It does become apparent that there is a lot of stress on the cables/strings (concentrated in certain spots where they roll over the single cam.) ~ You can see the "stretch" in the wrap/serving materials. FYI: This is not the factory string either. After two years of shooting, I had it replaced with a custom made one.
Now to be honest, I have two bows I'm presently shooting. I can't tell you which one shoots a faster arrow, as I don't have a chrono But they're close and I'm shooting the same arrows. My single cam Carnage ("over-rated" at 345 ibo) and the Chill-R (rated at 342 ibo.) Having shot the Chill-R for a few months, I went back and began shooting the Carnage. The one thing I noticed immediately is the difference in the draw cycle. Because of this, in real COLD weather, I think I'll be taking the single cam. (late season)
Also, I shoot "single pin." The one thing I can tell you regarding speed is I don't see any difference in arrow trajectory between these two bows. (Not out to ~30 anyways.) Beyond that distance, I haven't yet taken the time to do a comparison. ~ Different sights on the two different bows result in different "hold-over" to get the 40 yard shot. (One bow has a dovetail which extends the pin further out from the riser which "changes things" in terms of where to hold the pin.)
Having shot my new Chill-R several thousand shots, drawing it back at 72# seems quite "easy." Having said that (and also having just picked up my Carnage again)..... If I had a shoulder injury, there would be no questions in my mind which bow I would be trying to shoot.... Single cam Carnage feels like "butter."