Yeah I can't see why Toronto would do this. At #8 this year you're going to be lucky to get one of the top 5 D (Dahlin, Hughes, Bouchard, Dobson, Boqvist), so I don't see why Toronto would even consider it. Furthermore, the #27 pick is negligible because the Leafs already have #25, so there's really no point in getting another late 1st.
The only way the Leafs would do this is if Debrincat ++ were involved, and even then I don't think Dubas would ever touch this deal with a 10ft pole. Toronto needs established, young D. They don't need to accumulate picks like it's 2015.