Be aware with RDL seats, they will sit you 1-1/2" to 2" higher than stock due to their construction. I received this information straight from them when asking about modifying a used seat (which they were unwilling to do unless I ponied up full build cost). If you're inseam challenged, the reach to the ground with an RDL is unacceptable.
--G
To give this a little context ...
I have a Gen 1 with a Russell seat. I have a 33" in-seam and can easily flat-foot both feet with a slight bend in my knees/ I'm guessing the height wouldn't become an issue for anyone with an inseam of 31 inches.
For the short-arses among us, Russell can help by narrowing the front of the seat some. That would require shifting forwards as you come to a stop, but many riders do manage this okay. With Russell seats it is often the width that causes the problem rather than the seat height.
Hope that helps.