I think that's quite possible. When I was there in February Cameron had a 10mm crank on hand, that he actually sold the day I showed up. It's probably hit and miss on parts. I know most builders don't stock 10 of everything, but they do keep at least one on hand just in case. The 10mm Cub is a pretty common motors these days. I'm guessing you hit Cam at just the right time.
When you're dealing with cranks, you had better be prepared to wait. CW has horrible lead times. Even for the builders, they can take months. All of our billet cased DMs were 4-5 month builds. Cylinder, crank and cases all took a long time. That's just how it is.
535 Cheetah isn't a fucking 4mm Cub with cranks, pistons and cylinders readily available.
I applaud Jim for doing the RIGHT thing and getting the rods changed, even though it's taking longer than the customer wants. He should be commended for that, not ragged on by a bunch of fucking idiots that think they should have custom built motors in a week.