Wait, there was another escape pod? I'll have to check again, but this certainly adds weight to the Skywalker family conspiracy thing! I mean the theory was already convincing but what if it turns out that crazy old guy that everyone thought had been living in the desert had in fact been off-planet and only barely managed to get back (in that second escape pod) in time to find the boy and the robots?
This is obviously another one of these things where it looks like a smoothly-oiled operation but on closer inspection we see part of it that only barely scraped through by sheer luck.
Anyone unclear on the details should certainly refer to Mr Putnam's excellent documentary "Luke's Change: an Inside Job".