Think about how bad optics would be if Trump or MAGA rep had been elected Speaker and immediately started the impeachment investigations and process. Now that that is out of way and mostly done MAGA rep or even Trump could now enter and complete the tasks that McCarthy had promised to do (J-6 videos, defund IRS etc.,). I think McCarthy played his necessary role. Just my two cents in why Trump pushed for McCarthy in beginning when MAGA never wanted him.