So Trump is unable to attract talent? That's bad management right there. If these people are the best his pool of potential hires has to offer then Trump is terrible at attracting talent and it's his fault. If they aren't the best then Trump sucks as a hiring manager.
I imagine it's a combination of both. Trump is incompetent, disloyal, dishonest, and erratic. His administration is in near-constant chaos. That's not a situation most competent professionals want to place themselves in.because they are most likely concerned that they will have their reputations tarnished by working for him. As evidence of this can you name a single, solitary person who has seen their national stature improve after going to work for this White House?