The tiresome part of this board is the assumption that Murray is a "fit" pick. The Ivey stans think Ivey is BPA at 4, and the Murray stans think Murray is BPA at 4. I don't want Murray because I think he is a better "fit" for the roster. I want Murray because I have watched a lot of both of them, and I think Murray is the better player. That is a possible explanation - that people think Murray is the better player.
That said, I am fully onboard with trying to maximize the value of the #4 pick and trade down to take Murray. If it is true that everyone has Ivey as consensus #4, then you are foolish to not try to trade down and get assets from someone who wants Ivey. But do we know (other than mock drafts) that Ivey is consensus #4? There have been several rumors that the Spurs and Pacers are trying to trade up for Murray, not Ivey. There also might be some reality that Detroit prefers Murray to Ivey. So if Murray is the guy that Monte thinks is BPA at #4, and others think Murray is BPA at #4 or #5 and are trying to trade up to get him, that makes trading down VERY risky. If you are Monte, that means you could trade down and miss out on your target.
Now I don't know that Monte thinks Murray is BPA at #4. But I know that I do. And given that I think Murray is BPA at #4, that Murray is the best fit for the roster, and that trading down no longer looks as clear cut because there could be people moving into 4 or 5 to take the guy I think is BPA at #4, then I lean toward standing pat at #4. Now if there is a move on the table where a trade down gets me really great assets, then maybe I am willing to live with the fact that I miss on Murray, but that really depends on the trade down offers that are there.
All of that is to say, I don't think staying pat at #4 and taking Murray means Monte messed this up, or is a "middle manager." It could mean (like it means for me) that Murray is BPA at #4, Murray is also best fit for our roster at #4, and there is not a "blow our socks off" offer available to move down and risk missing the guy we like.