See this on the latest personnel move at the White House The "former adviser" was Tom Bossert, who, from his Wikipedia profile, seemed to be well-qualified to serve in that position. He also oversaw the cybersecurity unit at the NSC, helping to develop Trump’s cyber executive order, issued in May of last year, that vowed a new focus on protecting government networks and strengthening international and private-sector partnerships.
Since these positions are direct appointments by the president, there is no need for Senate confirmation hearings. I expect a replacement to be named pretty quickly. Maybe we should pay a bit more attention to who is serving in this position!
The only thing that worries me about building your own team is that it can be susceptible to groupthink.