Considering the current administrations lawyers claimed to have tweeted admission of obstruction, I wouldn’t be so sure they’re the brightest bunch out there. They probably figured it would be a cakewalk.
That was Trump's personal lawyer. He is separate from the lawyers at the FCC, or the White House Counsel, or the Attorney General, etc. There's a lot of different lawyers. Some of them are political veterans, and some of them are former corporate lawyers. They have a lot of experience between them.