Obviously, it's pretty clear that Keller was amused by the whole thing. Not only did he never want out at all, but there were never any talks between the team, his agent or himself regarding a potential deal to Toronto involving Nylander.
The Leafs, I'm sure, would not have minded this deal, as Keller remains signed for 4 more seasons at a very reasonable $7.15M per season. Not only that, but he and Nylander are coming off of comparable seasons in which Nylander finished with 87 points, while Keller finished with 86 points on a bottom-feeding Coyotes team. With Nylander's ask on his next deal exceeding $10M per season, it would have been a nice way for the Buds to save some money and still remain equally dangerous. Unfortunately, the rumour was never based in truth and Keller remains a Coyote.