Wayne, you may very well be right on this subject. Some of the Higgins, and Kennedy, families moved to Alabama after the Civil War. Both families were large, with several highly trained craftsmen, and gunsmiths on both sides. Anyone making Southern longrifles, with paneled buttplates, more than likely was apprenticed to one of these families. The stylistically unusual paneled buttplates no doubt got used periodically by these gunsmiths, on their higher end commissions, and almost without a doubt can be traced to Wiley Higgins.
Interestingly enough relative of both these families kept moving west, over time, until they wound up being neighbors in Lake County California.
Hungry Horse