Their current representation is based on the whole. If they split into 3, they should lose representation until the 3 hold their own special elections for new representation. Those seats are based on their (presumably 'legal')populations. It would be tough for me to accept any increase in their total representatives, only a shifting of the sands and hopefully some of that sand is of the red variety.
If I get time I'd like to go back and read some old stuff on the Virginia/West 'By God' Virginia split. Some history may be trying to repeat here. I don't want to be caught looking forward when I should be looking over my shoulder.