You got it backwards on the relationship between the TC and the Spanish cheapos.
The TC was the first mass-produced Hawken style rifle.
My buddy bought one in 1973!
The modern muzzleloading renaissance was in its infancy, in most states there was not a special muzzleloading season.
I bought my TC in 1980.
As the muzzleloading boom hit, the TC Hawken was at the forefront. It was probably the biggest selling muzzleloader out there.
Everybody liked it for its looks, accuracy, and ease of cleaning.
So everybody started copying the TC Hawken, ie, Cabelas, Traditions etc.
I have seen the TC Hawken called "The most-copied muzzleloader in history."