Not a sans fan but the parent plant is amazingly white. I would guess it is a slow grower?

The pup, should it maintain that degree of green, I imagine will prove to grow much faster/more vigorously than the parent plant. Heck, if you leave it attached, it may wind up supporting the parent plant to a large degree.

Paul-
S. parva is fast growing for a Sans and that one clone is surprisingly still a fair grower despite how white it is. There is a popular clone with a very thin yellow edge but I have never seen one like this................although I doubt it is a first. Paul this one certaily doesn't look like your standard Sans!

Did this one make it through last year's selection of what to keep and what to throw away?

Nothing gets "thrown away"!! This pup actually ended up growing out normal like its parent.

That is so strange! But very cool lol.