Gaborik/Phaneuf was sort of shake up/scenery.
The problem in 17-18 was Kopitar and Doughty. Kuemper didn't help either. Brown bouncing back to be a productive player again also didn't help. Quick having a year where he wasn't either hurt or putting up poor numbers, again, didn't help. That Stevens coached the team to to a point where they remained in the race while Carter was out for 55 games, one more time, didn't help. Had things fallen apart that year, then maybe there are guys moved out quicker. Not that the contract issues didn't exist at the time. If they miss the playoffs though, and Kopitar isn't playing at a certain level, then there's no Kovalchuk. There's not a thought of Pacioretty. Even Doughty might've paid attention to his surroundings and realized the team sucks, and why would he want to re-sign here?
There aren't many GMs that are going to make rebuilding trades when a team isn't bad. On Jan 25, 2018, the Kings were a couple points from being a top 10 overall team(in terms of record), and had a +16 goal differential, which was better than Washington's at the time. And St.Louis. And SJ. Still 2nd in GA. They were being outshot on average every game, but that's because they were no longer playing Sutter hockey.
O'Sullivan and Johnson were clever moves in and of themselves. Williams and Carter weren't part of that though, that's years and years later, so you can't add that in there to make it seem like it was part of some grand plan. That Carter was even available from not only Philly, but Columbus too, was a stroke of good luck. That Williams managed to get hurt so often might've made him available. He wasn't all that much older than O'Sullivan, and if he's not getting hurt, do they even get rid of him? He was a 30g/70pt guy for Carolina when healthy.
You could say O'Sullivan and Johnson gave DL younger assets with which to work. However, and certainly in Johnson's case, being a recent #3 pick in the draft, he was acquired to be a focal point of the defense. As was Hickey when he was selected at #4. Had anyone told DL in Oct 2006 that Johnson would be traded before the team won the Cup, I imagine DL would laugh in the face of anyone saying that.
If we're going to use the Cups to create a web of previous transactions that all fit together in a retroactively beautiful tapestry, then we do we blame Willsie for scoring that one game winning goal? That goal was part of destiny. Could even say it was an absolutely brilliant goal. Sure, DL still probably drafts Doughty #1, but he already had Johnson and Hickey there, and only Kopitar down the middle. Kopitar and Stamkos isn't a bad 1-2 punch. You never have to get Carter, you never have to get Richards. Maybe they don't have to draft Schenn. Maybe it's OEL instead, who knows.