Idler wheel size?

[Pinefarm]

I was doing a little day dreaming and looking at new toys. The Bowtech Independence sure looks sweet. My question is, exactly what is that 5" idler wheel going to do for the bow? My assumption is that it would make the draw butterlike. Any help on explaining the benefits of a large idler wheel?
http://www.bowtecharchery.com/bows/bows.html#

[Swamp Monster]

I would think that the idler wheel size would be dictated by the lobe of the bottom cam?? Plus those large eccentrics lead to a nice forgiving brace height, depending on risor design. I would think there would be less wear with large eccentrics (cams/idlers) as well...??

[deerslayer#1]

tiller

[TnRidge]

Level nock travel .