Mueller is clean from this standpoint (and setting aside any past actions):
The entire point of the SC was to call the bluff of crossfire; "ok, you say the intel was credible and the taps were warranted? Then finish that investigation and show us what you find. However you can only follow leads that existed at the time - no new Intel."
Mueller did just that, while giving Weissman et al a shot at polishing the turd into a diamond.