I think you over simplifying what linehan did, although I think it was time for him to go. He couldn't adjust his offense to Dak and I think they were being protective of Dak a little too with leaning on run game, which was a good thing in 2016, but 2018 we should have figured out what we have with him....
with that said, everyone kept clamoring over how Dak did when he got Cooper, but same can be said for Linehan and Garrett offense, that without the right talent, it couldn't work. it got much better after we got cooper. amazing isn't it!
now, in regards to Moore, he may bring in some new ideas. but its not just about scheming. most of the route trees, etc. are similar in the NFL. over the past 50+ years the teams play on same size field from every down and distance and it comes down to two things, play call (which is combination of routes, personnel) and execution. Moore is green as a play caller. can he play the chess match against veteran and savvy defensive coordinators!?
I read and article last year regarding McVay, in a game against minnesotta, he called a play from a formation that didn't work in the game initially in the first half, but he did it to see how the defense would respond to his formation, later in the game he called another play from same formation knowing what the defense was going to do.....little things like this take time to learn. there is a lot more, than just what this article said which 99.99% of the fans don't understand.
can Moore understand what the defense is doing, what the defensive coordinator is doing, or is he going to get tricked. its his first year....yes, some new scheme, etc. is going to be nice. but play calling takes time and experience. he may start hot, but given a few weeks and some tape, DC will figure out how to counter him....how he responds will be key and I do expect him to falter......