I'd guess the binder yield--meaning wide smooth leaves with no holes--is around 30%. I'll update that after I check this new pound. I also use the Piloto and Honduran seco for binder. The Olor is the fave, tho.
Okay, I just sorted that bag of Olor seco. First off, 134 whole leaves! Holy shit! High quality, unratty, actual whole leaves.
53 of them I graded as binder. That means the whole leaf can serve as a double binder, no holes in either side, thin, wide, long. Not all will make a toro, but all will make a corona, most will make a robusto. In a pinch I could go end-to-end and make Churchills with all of them.
81 I graded as filler, which means I move them to the bottom of the stack, and when I get to them most of them will have a half leaf that'll become a binder leaf, either as a single binder or matched up with other half leaves. The other side of the leaf has a hole in it somewhere, so those become used as filler.
53/134 = .3955, so 40% binder yield. Pretty darn good.