Good post. The only thing I really agree with is #4... I think there are pieces available that could assist, mostly in vet buyouts. There is trade potential but not much.
However, without adding some veteran piece to fix the size problem or the scoring/backup PG problem... I don't know if this team can really hope to beat the competition barring good luck (Lebron falls down the stairs?). Not unless the big three is saving up for a truly heroic post season of 45 minute games, anyways. And that IS a possibility.