The fact that multiple people very close to Trump (Manafort, Stone, Gates, Flynn), both personally and operational, met with Russian intelligence agents and assets helps the argument that the DOJ should be looking into Trump himself.
If Pompeo had evidence of Kerry having illegal talks, he had the opportunity to provide this evidence to the FBI, seeing as he was part of the administration at the time. Instead he chose to 'slam' Kerry during a news conference.
But still no answer to the question if Kerry pretended to represent the US government, which would have been illegal.
Contextualizing events with the knowledge that the FBI has shown itself to be a modern NKVD and the “intelligentsia” in journalism are happy to be mouthpieces of the US oligarchy actually saves you a lot of confusion.
Being lost in the moment of a blizzard of “crises” that really aren’t is intellectually paralyzing. Probably intentionally so.