Hmmm...not convinced. First, not all tango music is in 2/4. My understanding is that a lot of the very old stuff is, but there was a change to 4/4 predominantly later on. Also, there is no set timing for the 8cb, so I don't see how it would necessarily correlate (usefully) to the phrasing. Also, there are so many things that can be emphasized besides the phrasing. The beat, the melody, the instrumentation, other little thing stuck in there for good measure. And the possibilities are almost endless when you have a leader who's skilled enough to ask his follower to be playing with one element while he emphasizes something else. Just my $0.02.