We used 22 fantasy points as the milestone for QBs between yellow and green.  22 fantasy PPG would have put a QB in the top 5 in 2009.

We used 11 fantasy points as the milestone for WRs between yellow and green.  11 or more PPG puts a receiver among the top 10 in 2009.

If neither guy reached his milestone in a given fantasy playoff week, we assigned them both a red.

• Green/Green combo means that the QB and WR both achieved their milestone (22 QB and 11 WR) significantly increasing your chances of advancing to the Super Bowl.
• Green/Yellow - means that at least one of the combo met their milestone. 
• Yellow/Yellow - means that neither guy met their milestone but their combined score was over 22 fantasy points (ie the milestone of the QB only).
• Red/Red is-a-no-gooooood.  Season killer, more or less, unless the rest of your team went ballistic.  Your QB/WR combo scored below 22 points. 

Verdict:

From this 38 sets of QB1/WR1 fantasy playoff combo data-set, we are looking at the following:

• 19 fantasy playoff sets had at least 1 Red/Red combination in a fantasy playoff week.
  
• 8 fantasy playoff sets had at least 1 Yellow/Yellow combination in a fantasy playoff week.
  
• 11 fantasy playoff sets had all Green/Green (4 times) or at least all Green/Yellow combinations  (7 times)

I don't like the strategy.  19 out of 38 times it kills you at some point during the playoffs with a red/red.  Another 8 times in the playoffs your two guys are under-performing.  Only 11 of 38 fantasy playoff sets did it really not matter at all that you were handcuffing, andn of those, 4 times does the strategy actually paid huge dividends (Schaub/Johnson in 2009, Young/Rice in 1994, Favre/Freeman in 1994, and Rivers/Jackson in 2008).  

What this data only partially captures is all of the additional risk besides just bad performance out of one or the other.  What about weather?  One rain-storm out of nowhere can work to take out both of your guys in one Sunday afternoon in December.  How about injury?  Matt Schaub goes down in the first quarter, now how's your first round Andre Johnson looking?  Randy Moss's numbers took a noticeable dip ballin' with Matt Cassel in 2008.

I have never liked the strategy, this represents the first time I've actually taken a deep look at the data.  It's a fine strategy for the regular season - the weeks the combo go off is a near immediate win, but there is too much inter-dependency required for three straight weeks in the fantasy post-season to make it work for you season-in/season out.  If you are dying to draft a same team combo like this, go ahead and do it for the regular season,  but then make sure you trade one or the other before the deadline - or at least that would be my advice.