I look at BELs as just that. If you choose to breed a 6 gene x 6 gene and you end up producing BELs, it could be all 12 genes but to me its 2 genes because that is what is able to be determined. I avoid trying to complicate the gene pool so if BELs are desired, then the goal is to use single gene or 2 gene to minimize the guessing game.