Bifurcated Horn like Cobreflex For 8" Woofer

Hi, Are there disadvantages to bifurcating a horn in a similar method to a University Cobreflex, though for an 8" woofer crossed at 100hz? Also, why not double this formula and incorporate two more horn channels in the vertical orientation also? The primary benefit I see is working with smaller bore channels allows for greater efficiency gains in a small volume of horn space. Any caveats or suggestions are appreciated. Here is a diagram of what I have in mind though incorporating a 6"-8" woofer rather than compression driver.