I have to agree with you IRR3, unless the muffler is completely gutted and a replacement baffle is fitted inside the original cans.
There is not much to be gained by gutting the earlier Classic Triple muffler systems as these are reasonably open inside, the CAT box is the restricting factor.
The roadsters are quite a different story.
I have your solution. Put the stock lower right pipe back on. That is how I have my TORs set-up. I like the sound better than all 3 TORs. And I like the look with the 2 pipe ends closer to each other.