Buuxi weedha soo socota: Xilli ciyaareedkii 2015-16, Cowen wuxuu ku dhibtooday inuu isu adkeeyo safka Ottawa, mararka qaarkood wuxuu isku arkaa inuu yahay xoqitaan caafimaad leh. Bishii Febraayo 9, 2016, Cowen waxaa lagu daray ganacsi blockbuster, sagaal ciyaartoy oo lala yeeshay Toronto Maple Leafs. Cowen, Colin Greening, Milan Michalek, Tobias Lindberg iyo Ottawa's
2017 wareega labaad ee doorashada ayaa loo diray Toronto si loogu beddelo kabtanka Maple Leafs Dion Phaneuf, Matt Frattin, Casey Bailey, Ryan Rupert iyo Cody Donaghey. Bishii Febraayo 26, 2016, Cowen waxaa laga saaray qandaraaskii kooxda Maple Leafs ka dibna waxaa loo qoondeeyay kooxda AHL, ee Toronto Marlies. Cowen ayaa markaa dib loogu soo celiyay Toronto si uu u sugo iibsi waxaana la siiyay xorriyadda uu kula xiriiri karo kooxaha kale qandaraas cusub oo loogu talagalay xilli ciyaareedka 2016-17; iibsashada qandaraaska Cowen waxay siin doontaa Leafs $ 650,000 oo ah mushaharka mushaharka xilli ciyaareedka 2016-17.