I'll consult The Book to see what the one true rebelay crossing technique is. I may have to do some resto as a penance.
I just checked THE BOOK to see what the one true rebelay crossing technique is and unfortunately it seems as if I will be spending eternity with Derek doing restoration. Neither of us is in compliance with Alpine Caving Techniques Chapter J verse 3.5 Passing a Rebelay. ACT does not discuss using either a long cowstail to clip the to the long loop the Stan/right way or using an ascender to attach below the knot on the rebelay anchor the Derek/wrong way.
I do know that many of my European caving friends pass rebelays this way and that most of them are still alive. Meanwhile I will continue clipping my long cowstail into the loop when I pass rebelays.