The Leafs have traded away so many picks and youngsters that it has been so difficult getting a younger team. Instead of having players on ELCs, every year the Leafs scramble to get aging veterans to fill the rosters at about 800,000.
Looks like Cowan and Minten will be Leafs, but it shouldn't be in October. Let him be pros with the Marlies. If they are good enough to be called up, good for them, but a full season or near full season with the Marlies is probably the most likely and best scenario.
Your lineup....Holmberg as earned a spot. Brodie won't be Leafs and neither will Roy, so that's 8m to spend two other UFA Dmen. Domi or someone at about 3.25 is needed at centre. Jarnkrok is a winger.

Problem is Cowan I am pretty sure is not eligible for AHL and with his season in he OHL the Leafs need to decide to play him or keep him in the OHL. I think the Leafs will look and keep forward signings minimal in case Cowan proves himself in training camp and if not then hope sending him back to the OHL helps his development.