By the way, is there a topic on this thread debating about the icon theory? If the theory remains the way it is (with only 21 world icons), Isaac's chances look very grim indeed...
Okay, there are at least 21 icons, with two blank spaces. One blank space (spot 13) logically belongs to the G&W icon, so lets assume the Mr G&W is in. Let's make two more realistic assumptions. First, we assume a new Nintendo series gets represented, and guess that Captain Olimar will be playable; that seems like a reasonable guess. Second, lets assume that we will get a third third-party character, say, Rockman (Megaman); also, a reasonable guess. Those are two new, distinct series, so they would each get their own icon. My disbelief of the ridiculous alphabetical jury-rigging aside, alphabetically, there's room for either in spot 19, but not both. That would mean that the other series would end up at spot 22+, which kills off the alphabetization theory anyway.
Let's say one of my assumptions is incorrect.
1) No Mr G&W: If there is no Mr G&W, then the icon theory is (more) dead because there's no other series that would logically fit into that spot.
2) No new Nintendo series gets represented: This seems quite unlikely. It's been over half a decade since the last game in the series, so you would think that Sakurai would consider at least one new series from that timeframe. The most obvious choice is Olimar; I really can't believe that he won't make it in.
3) No additional third-party character: This seems unlikely as well; most people seem to think that we will get at least 3. Sakurai did say that, other than Snake, the game would likely have 1 or 2 more.
2&3) No new series at all? That doesn't seem at all likely.
Therefore, there is nothing grim about his chances. The theory just doesn't make sense.
So, basically, icon theory is dumb.