That is very possible, but since Vrana had to agree to go down for the conditioning stint, I am not sure if that is a possible situation. Unless he agreed to the original 1 week or however long it was and when they said he needs to stay for the full 2 weeks then he may have a gripe with that, since he didn't agree to it. If that is the case, then he might have a leg to stand on, unless there are some lawyer/contract stuff that changes things.
Your right, technically he would be taking their spot in the group. That one skipped me a bit.
At that same time, you have to wonder did soderblom officially make the roster then because a healthy vrana is better than soderblom, at least offensively. They might be a wash defensively.