Hell Spinners Probably Doing The Same Thing - Tumblr Posts
Here is the PLF meeting table:

There is one empty chair as seen next to Re-Destro. Since this scene happens right around the time Shigaraki starts his surgery, and assuming Geten is in the seat Hawks is blocking, that empty chair is Shigaraki’s.
Now you may ask why Shigaraki would want to sit next to Re-Destro of all people? However, the answer of Shigaraki’s placement at the table has nothing to do with Re-Destro, but is instead influenced by where someone else is sitting.
Take a look across the table from Shigaraki’s seat and who do you see?
Spinner.
Sitting directly in the center of Shigaraki’s hypothetical field of vision. Shigaraki chose that seat for the sole purpose of having the excuse to stare at his scaley boyfriend and not pay attention to anything else. Who cares if Re-Destro is acting obnoxious when Shigaraki can just tune him out while admiring Spinner.
TLDR: Shigaraki chose his seat specifically so he could look at Spinner. Spinaraki confirmed.