Yeah, I agree that it would be good to have some better rim protection on the inside from an athletic big man. Splitter did a great job given his skill set this year. Let's not discount that. But Luis Scola is not going to give you anything better than splitter, in fact he would be a downgrade in most respects.
If we want to beat Miami, we have to get better and we need athleticism. We need another guard who can create his own shot. Erick Green Would not be a bad option and he has been linked to the Spurs.