Robertson has been frustrated with his lack of ice time and production in Toronto, and feels the spotlight is taken away from him by the likes of Matthews, Marner and Tavares, and has publicly stated he wants to be traded.
In terms of the Blue Jackets, Proteau believes that Robertson would have a real chance at shining on their top two lines there, which is exactly what he wants, and Columbus is desperate for some offense after being bottom feeders for the past several years.
As for Vegas, Robertson would likely slot in the middle-six, as the Golden Knights attempt to re-tool their team so that they can get back to winning the Stanley Cup. One thing's for sure, the Leafs do not need anymore distractions next season, as they desperately attempt to get over the playoff hump. A disgruntled Robertson would not be a good look, so Leafs' GM Brad Treliving is likely working hard to close this deal.