I’ve been developing my BnB trying to make it as universal as possible, in terms of starters and the opponent’s weight/size while also incorporating MFC hitconfirms since I’ve got weird reactions times.
My current BnB (the one I mentioned earlier), very easy and borderline obsolete by now is:
:h:, MFC,
:h: xx :qcb: :h:,
:h:, :dp::l: xx :qcf::l: ,
:h::s:, 
:h::d::h: xx :dp::h: xx :qcf::l:, :qcf:
(OTG), :qcf::atk::atk:
With the super mashed, did 627 900 damage. At least it’s reliable. With an extra
:h:, MFC in the middle before
:h::s:, the combo does slightly more damage but has the danger of crossing under after the launch.
With ETR’s awesome new tech, using :dp::l: xx :qcf::l: as filler in the middle of the combo, before the
:h::s:, today I managed to make it do 685 300 damage.
I tried several other alternatives, but nothing more complex seems to be possible from any starter. Still, managed to do a slightly more damaging combo that starts with a MFC hitconfirm, using half of a Vanilla combo, half of a new-school H MF directly into CS.
:h:, MFC,
:h: xx :qcb: :h:,
:h:, :qcf::l:,
:h: xx :qcb: :h:, :dp::l: xx :qcf::l:,
:h::s:, 
:h::d::h: xx :dp::h: xx :qcf::l:, :qcf:
(OTG), :qcf::atk::atk:
Difference isn’t much, deals 666 700 damage, but it’s better and it does a complete wall carry, which is great for hitting the OTG into super. Can be started with crouching
:h:, but then the timing for catching the opponent before the launcher is somewhat strict because of height differences. Starting with a L Talon Attack, after the launcher it’s best to just do :h: xx :dp::h: xx :qcf::l:, as otherwise the opponent will tech, but it’ll still do a bit more damage.
By the way, ETR, in your 656k damage BnB, you’d do a lot more damage with just one
hit. About 40k more.
As for ETR’s CS loop, it’s really cool. I always wondered if she was able to do it before Ultimate came out and it turns out it’s possible, but hard as shit. It’s also possible to start with a M CS (and still do a total of three CSs), but I’m not too sure if it actually does more damage. It takes me a lot of time just to test.
I think the best thing about it is not to only see it as a loop, but also a good idea for combo filler as well as possibly a good combo starter. After all, it doesn’t have to start exactly in the corner, point blank.