Yes. As for lavender, purple or white, all 3 can come from white albino aka clark strain if I am correct. Its just a roll of the dice.
To figure out the %, just add up the total of both parents and divide by 2. That will give you the % of the offsprings.
As for anery, well if the parents are anery then yes I would imagine but what % you don't know unless you know the parents. I'm not really up on the genetics of retics though with SD and dwarf. I believe the only morph for a pure SD can be anery so depending what the other parent is....
And honestly, 18% SD is pretty much nothing. I imagine it will be as hard to sell the babies as it would be to sell any dwarf or mainland. I mean a dwarf can still reach like 12-14' I believe and the mainland can get even bigger so that 18% isn't going to shrink that snake by much. Most people seem to want 50% SD or at least a fairly high % of SD along with dwarf.