Trump’s GS bankers are totally different from the GS bankers Hillary would have appointed...
I imagine that there are lots of capable folks in the Midwest, Texas, etc. that run banks, work in state government, etc. that might bring a healthy perspective to the swamp. But - Trump doesn’t know them. So he draws from the people he does know.
Of course if he found them in his own companies (which I am sure they are as capable as these GS guys) he would be called out on cronyism.