The reason youve never seen it is because with her old layout she was not able to do that if she wanted a 3Lz+3T combo in the 2nd half. (number of jumps allowed to be repeadted rule). There have been several practice clips of her doing 4T+3T not to forget the insane quads combos Kamilla, Sasha and Anna delivered on the channel 1 jump competition.I don't think I've even seen her do 4T-3T much less adding it to a new quad. Learning 4S freed her from doing a 4T-2T combo. My layout would be 3A 4S 4T 3Lz-3T // 3Lz-Eu-3S 3F-3T 3Lo.
I think any of these skaters could tag a +3T to essentially any jump that they land with good glide.

