Agree with this. The number one priority should be locking up Henderson, Holliday, and to a lesser extent, Adley. Not that I don't want Adley around...I'm just not sure how many years you want to invest in a catcher.
Making a deal for a guy like Burnes this year could be an annual/semi-annual kind of thing. Maybe you splurge one year and trade for a guy with two years left before FA where you may have to give up a bigger prospect. I don't think it's smart to have long-term money in pitching.