Looks like you hit great odds if you were looking to produce a lot of leathers!
Seeing that you produced a silky (even though it was just one) proves that both parents are at least co-dom leatherbacks. The large amount of leathers were just luck of the draw.
The combination of both the recessive and co-dom leathers (aka micros) makes it all that much harder to tell which animals are true micros and which are just really smooth co-dom leathers. I would go as far to say that the animal that you think is a "micro" in this clutch is just a really smooth leather.
With all of that said, I've never worked with recessive leathers, but have seen your typical co-dom leatherback throw everything from extremely smooth leathers with hardly any side spikes, all the way to extremely bumpy animals that were hard to even distinguish as leathers.