I think so and I've owned Omega Bipoles for more than five years. So you're saying, in all cases, you could tell the difference? 
It would be an interesting experiment.
As a dealer I've had many Omegas go through my place. All I'd heard up until I got my first Omegas about 6 years ago was nothing but multi way speakers (since 1973). 2 way, 3 way, dome, ribbon, horn, and electrostatic. The Omegas ended my search.
The closest crossovered speaker to an Omega were some large beer fridge sized 2 ways with vintage Altec drivers (which equivalent today would run about $15,000 - $20,000 a pair). They were sublime, and sounded similar to the (pint sized by comparison) Super Alnico Monitors I have here.
Lets take your argument to a different level. Single driver speakers are (through urban legend which is usually false) reputed to be mainly good for intimate listening of small ensembles and acoustic instruments, mainly midrange without the frequency extensions a multi way speaker is capable of, and cannot unravel complex music as well, oh yes, and low dynamics. What you are saying is you can't tell the difference between multi way and single driver, which brings out at least one fact:
1) Omega, any Omega is capable of playing any kind of music as well or better as the best multi driver speaker anywhere near their price...and no tweeter needed, hence no crossover needed.
Why you're unable to hear the difference particularly in the midrange, coherence, and directness of the Omegas is honestly beyond me.
What amp did you play your bipoles on and what bipoles did you have (with what driver)?
