The part that I don't see working with that theory is that when you have a single proc, you don't get just that hand sped up (I think). For instance, in that same combat log, check this part out from the very first flurry in the combat log:
6/6 11:06:54.125 You hit Servant of Allistarj for 98. (OH)
6/6 11:06:54.187 You hit Servant of Allistarj for 296. (MH)
6/6 11:06:56.734 You hit Servant of Allistarj for 237. (MH)
6/6 11:06:56.734 You crit Servant of Allistarj for 198. (OH) <-- flurry!
6/6 11:06:57.515 You gain Flurry.
6/6 11:06:58.781 You hit Servant of Allistarj for 290. (MH) - 2.047
6/6 11:06:59.062 You hit Servant of Allistarj for 104. (OH) - 2.328
6/6 11:07:00.031 You hit Servant of Allistarj for 269. (MH) - 1.250
6/6 11:07:01.187 You hit Servant of Allistarj for 101. (OH) - 2.125
6/6 11:07:02.140 Flurry fades from you.
(after that there are a bunch of regular hits with "normal" weapon delay)
In this example, Flurry is clearly evident on both hands (and wow @ that 1.25 delay main hand swing), even though only the off hand crit proc'd it.