Not sure how you call that building depth you trade Jones and he’s part of our depth
The star piece coming back is a undersized goalie
The kings don’t have enough first to make a deal like this happen
We sold already sold The Great One to the kings weren’t selling DcDavid to

no way the oilers trade mcdavid.

Caleb Jones would be traded for Matt Roy in this scenario, which would be an upgrade. Last season, Matt Roy had 18 points with a +16 plus-minus, while Caleb Jones only had 9 points with a -1 plus-minus.
Also, Cal Petersen is a heavier weight than superstar goaltender Marc-Andre Fleury, and he had a .923 save percentage in 19 games with the Kings, and he's only 25 years of age, plus he'd be a backup to Koskinen.

Again, this wouldn't happen in real life, this is just a fantasy roster.

The point is there’s not enough coming in return for McDavid let alone adding move oilers to the trade.

Trading McDavid would be to free up cap space for potential depth-pieces, as well as get a decent return in Alex Iafallo, who had 43 points last season. Already with this roster, you'd have four complete lines and a complete blueline, and enough cap space to improve the third and fourth line as well as the blueline to build the depth needed to build a cup-contender. Plus, the RNH-Draisaitl-Yamamoto line, which I would argue was the main reason the Oilers got out of the basement this past year, would still be in-tact.
McDavid is the best player in the league, no doubt, but in today's NHL, you need depth, not top-heavy superstar talent, in order to be a cup-contender.

We are one yr from having all the cap space we need to address them problems so your point is mute
Neal will be package with a pick to have Seattle take him in the expansion draft freeing up another 5.75 mil in cap
Nurse will also be moved next yr as Broberg takes his spot freeing up another 5 plus mil in cap
This team will look and will be built completely different in 2021/22 and we don’t need to trade MsDavid to do that

True, but you'd still have to settle for cheaper talent to keep the cap that low, while freeing up 12million for McDavid on top of what you're getting back for Neal and Nurse would allow you to spend more to build an immediate cup favorite while staying in cap-heaven.
Again though, this is just a fantasy-roster, and I will admit I'm not the best expert at hand regarding this subject.
The main idea behind this roster is to build the Oilers similarly to the Avalanche, by giving them a four-line team with a superstar forward (Draisaitl) in the top-line while also keeping them in cap-heaven for further potential improvement.

no way this is serious