Both of those driver models listed have pretty long voice coils for a horn loaded sub that has a relatively high low frequency cut off.
While I'm not sure about the RCF, the B&C is a pretty robust woofer. The TBX series had a splitting ferrite issue for a while, I'm pretty sure they've fixed it.
EAW might have used the RCF driver because at the time they made the BH882, they were all part of the same company.
It's certainly not the optimum driver for it nor is the TBX100.