There is much still unknown about the Mueller probe that may come out in the coming weeks. My best guess is that the delay in his appearance before the house committees is due to the dem’s trying to craft a set of rules that will limit testimony to discussion on only what his subordinates thought or found. They really would like a crack at running through his entire staff until they find someone that testifies that Orange Man bad.
The reason they want to limit it to that is they really don’t want Mueller to talk to how he could have an investigation into Russian involvement in the election and not address the Hillary’s computer or WikiLeaks. They certainly don’t want to talk about when the conclusion was reached that there was no illegal involvement between the Trump campaign and the Russian government. If Mueller admits this occurred early on then it exposes the fact that they spent almost 2 years trying to get someone in his administration to walk into a process trap.
These are not good folk. They are the same swamp creatures that have all but destroyed our country.