You should and will get murdered by Montreal fans. A young #1 D+a top 5 goalie for an unproven prospect with elite potential+an injury prone top 6 forward as the base of this trade is absolutely brutal. I doubt Montreal would trade either one of those guys straight up for Yakupov, and you have them giving up both for essentially Yakupov+a low value top 6 forward.
1: Salary cap
2: Edmonton doesn't need a better goalie
3: Both teams probably say no.
4: Whitney plays behind Petry/Smid
5: Whitney will be a UFA after this season, so if the season is canceled the line-up will look very different.