Ramba uchiverenga ndima iyi - Joshua akakurira kuMichigan, achitamba hockey yechidiki yeHoneybaked U16 midget team uye akakokwa kuUSA Hockey Select National Team Evaluation Camp. Mushure megore ra2011-12, Joshua akasarudzwa neSioux Falls Stampede mumutambo wechitatu weUnited States Hockey League (USHL). Mushure mekuparadzanisa mwaka wa2012 / 13 pakati peHoneybaked neUSHL, Joshua akasarudzwa 156th yakazara nePlymouth Whalers panguva yeOntario Hockey League Priority Selection. Pasinei nokurohwa, akaramba achitamba muOHL nokuda kwegore ra2013-14 uye akaiswa 157th yose pakati peNorth American skaters neNHL Central Scouting Bureau. Joshua akazosarudzwa mumutambo wechishanu, 128th yose, mu 2014 NHL Entry Draft
neToronto Maple Leafs. Akanga asingazivi kuti akanga aunganidzwa kutozosvikira agamuchira runhare rwakabva kuvatungamiriri veToronto paakanga ari mumotokari. Mushure mekunyora Joshua, Leafs amateur scouting director Dave Morrison akataura zvakanaka nezvake semutambi, achiti: "Iye murefu, mutambi chaizvo uye takaona kumwe kupenya kwehunyanzvi hwakanaka chaihwo pakupera kwegore. Varairidzi vake havana kukwanisa kutaura zvinhu zvakanaka zvakakwana pamusoro pake. Anoshingaira zvikuru munzira mbiri dzomutambo, mutambi anogona kuva pakati pevatambi vapfumbamwe vakakurumbira". Joshua akapedza mwaka miviri izere neStampede, panguva yaakavabatsira kuhwina mukombe weClark Cup wa2015.