NTS, here's the more complete version of the Henkel docs:
http://www.wftv.com/pdf/21540602/detail.html
This version has both "revision 1" and "revision 2." You can see that one of the things revised in 2005 was the item number. In fact, on the bottom of revision 2, it says the revision was to "add item number."
On both revisions, the vendor is listed as Shurtape.
The Henkel specifications do say that the warp is 35% cotton/65% polyester and include the thread count, etc. The Henkel docs are prepared for a different purpose than the FBI docs and would not need other information such as color and shape of fibers.
The yardage measurement is just the length of the roll. Different roll lengths do not mean that the 2 rolls are "completely different products."
Obviously, the cotton fibers at the scene would not all have disintegrated at the same rate. Lots of the shirt was disintegrated. The parts that survived the best were the iron-on letters and the reinforced hems. Children's shorts are generally built of much sturdier stuff than children's T-shirts. And don't forget that certain cotton things in that swamp (including the duct tape) would have been soaked in decomp fluid as well, which no doubt affects the rate of disintegration.
But most importantly,
the SA will not have to prove that the cotton rotted away. It is a CERTAINTY that the cotton rotted away, because the printing on the tape makes it a CERTAINTY that it was this specific type of Henkel tape, which makes it a CERTAINTY that it contained cotton fibers. I mean, what are the options? (1) The cotton rotted away in the swamp, which means that the tape was originally exactly the same as the gas can tape, (2) some CSI fan (Casey?) took the duct tape, before applying it to Caylee's face, and carefully removed the glue, then UNWOUND THE COTTON/POLY BLEND THREADS from the warp of the duct tape, then reapplied the polyester threads in a weave pattern back onto the duct tape, then reapplied the same exact adhesive to the tape...but wait, this would still mean that the remains tape originally matched the gas can tape, or (3) the roll of tape used on Caylee was an unauthorized KNOCK-OFF roll containing no cotton but managing to contain EXACTLY TO EVERY MICROSCOPIC DETAIL all other fibers and adhesives used by Henkel, while the roll used on the gas can was a REAL Henkel roll coincidentally used by the A. family.
Well, if it's #3 all I can say is this is the highest-quality knock-off product I have ever heard of. They must have had a guy on the inside to get them all the other fibers and adhesive; the only thing they left out was the pretty cheap cotton component; and the tape was so amazing that it stayed on a corpse in a swamp and held the jaw together for 6 months, even after the body was completely skeletonized. What's the point of making a knock-off if you're going to make it just as good as the real thing?