The biggest issue with GSH in stocking combinations not involving LMB is two fold and is based on giving GSH too big of a head start on the predators.

First, is an over abundance issue. Let's just say you stock 2 pounds per acre of of mid size GSH, you're looking at about 80 or so GSH per pound, that's 160 GSH. If they go in before your predator fish, they will likely see high survival rates. They also are likely to spawn and prolifically. Since no predators are present yet, it's likely huge numbers of the GSH newly born in your pond will survive, thousands very likely.

Then you stock your SMB at the typical 4-6" range. By then, those thousands of GSH are too big for these newly stocked SMB to prey on. They will likely remain too big for the SMB to ever prey on... Throw in the original stockers and you now have thousands of GSH too big to be preyed on. In LMB ponds this isn't such an issue as LMB mouths are much larger, LMB grow much bigger and do so much faster. SMB and HSB, have smaller mouths and especially for SMB slower growth rates and maximum size.

Unfortunately, GSH are effective predators in their own right at larger sizes and will gladly eat many other species' eggs and fry. Species that are likely better forage options for the SMB and HSB, even WE... Larger invertebrates(grass shrimp, small crayfish, dragonfly larvae, etc), other Cyprinid species which don't get too large such as FHM, BNM, ESM and SFS. Other species of forage like BKF and LCS. Most of these fish species simply broadcast their eggs with no parental care or protection and all have vulnerable fry, easy food for oversized ravenous GSH present in large numbers.

Second, GSH regularly reach 6 or even 8 inches. A size too big for most SMB and HSB to prey on. You could end up with GSH taking up huge amounts of biomass in your pond and no predators large enough to prey on them. GSH can live 6-8+ years. It's gonna take a long time for that original glut of GSH to die off...

Personally, I feel GSH should be treated similar to GSHAD in LMB pounds when stocked into SMB only or in combination with HSB. GSH should only be stocked after 25%+ of SMB are 14" plus and HSB if stocked are 18"+.

At that time stock 1-2 pounds of the largest brooder GSH you can source per acre. These GSH should be in the 5"+ range and just a hair too big to be effectively preyed on by the largest SMB and HSB in your pond. You get a good brood stock of GSH established without a glut of biomass hogging, egg and fry eating, bait stealing pains... You also allow your less aggressive, smaller forage species a chance to establish and a better chance to maintain a self sustaining population.