Kate I think you still don't get the significance of a point that I explained pages back.
1 - A catalytic reaction results in linear growth of the end product.
2 - An autocatalytic reaction results in exponential growth of the end product.
3 - Amino acids are autocatalytic.
4 - A tiny difference in the size of two competing populations of autocatalytic molecules will be amplified exponentially.
F.C. Frank postulated this as a solution to homochirality in 1974 and Kenso Soai first proved he was correct with a groundbreaking experiment in 1995. He has continued to confirm his results in a series of experiments and papers since then.
In his latest success he started with a chiral mixture with a tiny 'ee' (enantiomeric excess) of just 0.00005%. Following the autocatalytic reaction the 'ee' was over 99.5%.
The puzzle is solved.