To do that, Ishikawa will have to beat Zhu and Hirano/Ito will have to beat Wang Manyu. Sounds like a tall task. Chances are they all leave Swedish Open with no bonus points and Ito is still vulnerable to the thousand or so bonus points gained by her teammates at the women's world cup
I agree, Sweden is kinda pointless (no pun), but you never know, look at 2018 ;-)
Even without WC, Ito is still sufficiently ahead for now. Lets do the math, Ito is 1010 pts ahead of Ishikawa, and ONLY the BEST 8 counts (+T2). The points Ishikawa can gain at WC is balanced by dropping one of the 8. So lets say she gets to semi-final, worth1530 pts, this will be counter balanced by dropping her lowest 900 pts to make up the best 8. Thus she only actually gains 630 pts on Ito because of the WC. Ishikawa would have to reach silver to be only 5 pts ahead of Ito in the overall.
For Sweden, its the semi that allow a standing improvement, for Germany & Austria, its the 1/4 finals, for all 3 of them.