esshup - do you think the northern and Neosho SMB in that pond are creating hybrids. 5 lb is a pretty big individual for Neosho strain SMB.
They may be BUT the looks of this particular fish shows absolutely 0 traits of a Northern SMB. These Neosho have been in the pond for IIRC (without looking at my records) 7-8 years and the Northern have only been in the pond for 2 years.