Remember when the theater kids were urging the 2016 electors to be faithless or speculating as to whether the generals could prevent DJT from taking office? No crimes committed in having such thoughts or expressing such opinions or seeking such methods to get what they thought was right.
Storming the capitol was certainly a violent BLM-style riot and trespass and obstruction (and the rioters get what they get) , but there's no evidence anyone intended to actually overthrow the govt and replace it with something different. Different constitution, different elected officials, different laws, etc.
It's all hyperbole, just like the Steele Dossier that was used to fool the FISA court into approving those investigations. If they can prove Trump committed a crime then he gets what he gets too; but even instigating a riot doesn't amount to insurrection or sedition.