The video that prosecutors showed at his trial, where he was part of a group smashing through the door, is on youtube if you look. I’m on a super slow connection right now or I’d link it, bit I have seen it.
My guess is that what Tucker showed was from early in the day, when things were calm, and he then went back outside, or was escorted out there. Then he came back in with the group that smashed the doors open.
This video purports to show Jacob Chansley entering the capitol. It’s not playing properly for me (perhaps due to server overload) but I didn’t see him going in there.
https://www.youtube.com/watch?v=FHPHQcteTUg