Why would Toronto do that? Heck even Vegas doing that is headscratching.

I mean I'm a VGK fan and made the trade. In the event we lose Barbashev we need another winger to play with Eichel, and a long term solution as a linemate for him. Boeser fits the bill, and we already need a cap casualty. So Marty is gone with Cotts to get Boeser with retention.

Why would you trade Myers and give up a 2nd and a 4th if you have 9 million dollars in capspace?

Because Myers is liability on the ice regardless of cap.

Why Brock to Vegas?
This makes no sense.

You could just keep him as an extra or scratch him for the year, heck you could retain 50% and get a 3rd or something of that nature in return. There is no need to give up a 2nd and a 4th in this scenario.

Why would TO make this trade though? Jarnkrock makes less than half and produced as much

Jarnkrok is a similar player for less than half the cap

CHI probably accepts.