I'm surprised riding with blue jeans would only wear the right back edge of the saddle, very little friction there, unless your riding with a huge wallet, wallet with a chain, or wrench in your right rear pocket. ( the huge wallet can be remedied, I'll send an address if you're interested!) I would think the abrasion would come along the upper front edges from your leg motion? Odd to see abrasion only there if it was from jeans.

You must be light as a feather, mine begin to show signs (patina) within the first few days, not quite like that but definate indentations and color change.