Sounds like the speculation works as follows:
a.) Mini-camps will decide who is the starter this year.
b.) If Losman loses the battle, there's no sense keeping him around. In other words, if he doesn't even practice well, there's no "hope" for him to turn it into good on-the-field play. You don't give him first round money to be a backup.
c.) if he's not going to perform well, then try to get something for him, going with "plan b" Nall as the backup/QB of the future...
I don't think things are decided already, I think it's more about having a plan B in case they don't work out as hoped....regardless, it's all speculation. They could very well be quietly testing the market to see what their options are. But to automatically assume that they are going to trade him based on what one reporter says is kinda silly...