Has anyone reasoned how far south this island would be? I'm assuming it's far from the equator, but can't say if it would be close to the antarchtic circle. Vegetation is not similar to that one would tend to find in the tundra however.
Perhaps if we get beyond a few months more can be reasoned, aka we begin seeing "Lost caste faces their first winter". How severe, early it comes might help ascertain if they're closer to the equator or the south pole.
On the size, I haven't heard that albinos are necessarily smaller. Hmm... The gene that effects this (at least in humans) is one that is able to convert phenoalanene, through a chain of conversions, to the amino acid needed for melanin production, as I remember. Taurine is the amino acid mentioned in these pages, but isn't an essential amino acid (our body can synthesize taurine), though phenoalenine would be a 'starting essential" amino acide we can't manufacture. Without this, no matter how much melanin our genes might call for the production of, the amino acid (which is not readily found in our food, and is a less common one in food sources) is simply not getting synthesized for use.
BTW, and as an aside, looking at the amino acids thsemselves
http://en.wikipedia.org/wiki/Essential_amino_acid
they now list 10 essential amino acids (not 8, such as they did when I was back in school). Beef is no longer being counted as a "complete protein" anymore. Umm, OK, maybe they learned otherwise, not how it was listed when I was learning this.
I do see mention of eye problems wrt albinism, but not problems with manufacturing growth harmone or the like... If the amino acid one can't synthesize is also used in growth harmone, I wouldn't rule it out as impossible however.