Don't sign anyone, hope and pray that the reports are true that it's a clean break and there is no ligament damage.. seems the general consensus is if it is in fact a clean break, and if he rehabs well, a March return is not out of the realm of possibility.
That being said, don't sign anyone, and let's see what these young guys are about. If nothing else, the experience they get this year from this awful injury will make them that much better to come out and play next season.. hopefully with a fully recovered Gordon.