Nyorai kuenderera mberi kweiyi ndima - Theodore akatanga basa rake rehoki duku neAldergrove Minor Hockey Association, panguva iyo akazvisimbisa semutambi akatanhamara munhoroondo yechikwata ichi. Basa rake rakabudirira rakamuita kuti asarudzwe mu2010 WHL Bantam Draft, neSeattle Thunderbirds. Munguva yake neboka, Theodore akashanda semutungamiriri uye akakwikwidza kuTeam Canada mumakwikwi akasiyana siyana epasi rose. Akakunda menduru yegoridhe pa2013 IIHF World U18 Championships uye 2015 World Junior Ice Hockey Championships
uye menduru yesirivha pa2019 IIHF World Championship.