If all the GOP Members of Congress who were on the pardon list are under investigation (with Perry and Jordan, Biggs, Gosar, Gaetz, Marge), that gets you to 6 of a likely 7 seat majority.
Then there are two freshmen MoCs who were at Jan6, Van Orden and Santos.
The MoC exposure BY ITSELF justifies a Special Counsel.
https://www.washingtonpost.com/politics/2022/11/15/derrick-van-orden-jan-6-congress/