Hum, I suppose it is possible. The quote I found which I hoped to refute your point actually doesn't do that. From the Barnes and Noble Q&A:
This is pre-Way of Kings, of course, and combine this with a more detailed list of the four Shards:
I firmly believe Odium is the last one, because we hadn't met it directly, but we sure saw his influence on Elantris's world. So with the first quote, it's clear that Odium was gone by the time of Elantris.
However, that doesn't restrict Odium from going to Sel ten years ago. But I would think if he had, the Letter writer would have mentioned that...