▁the ▁Guard ians ▁split ▁into ▁fa ctions , ▁one ▁of ▁which ▁appointed ▁a ▁newly ▁rev ived ▁Gard ner ▁as ▁their ▁champion . ▁As ▁a ▁result ▁of ▁his ▁years ▁in ▁a ▁com a , ▁Guy ▁was ▁em otion ally ▁un stable , ▁although ▁he ▁still ▁mostly ▁managed ▁to ▁fight ▁val i antly . ▁He ▁has ▁gone ▁through ▁many ▁changes , ▁including ▁w ield ing ▁Sin estro ' s ▁yellow ▁Guardian ▁power ▁ring , ▁then ▁gain ing ▁and ▁losing ▁V uld arian ▁powers , ▁and ▁read mission ▁to ▁the ▁Corps ▁during ▁Green ▁Lan tern : ▁Reb irth . ▁He ▁later ▁became ▁part ▁of ▁the ▁Green ▁Lan tern ▁Honor ▁Guard , ▁and ▁over se es ▁the ▁training ▁of ▁new ▁Green ▁Lan tern s . ▁Gard ner ▁is ▁designated ▁as ▁Green ▁Lan tern ▁ 2 8 1 4 . 2 ▁within ▁the ▁Corps . ▁ ▁Guy ▁Gard ner ▁helped ▁lead ▁the ▁defense ▁of ▁O a ▁during ▁the ▁events ▁of ▁Black est ▁Night . ▁ ▁Following ▁his ▁out standing ▁acts ▁of ▁val our , ▁the ▁Guard ians ▁appoint ▁Guy ▁to ▁a ▁unique ▁role ▁and ▁highest ▁rank ▁in ▁the ▁Green ▁Lan tern ▁Corps - S entin el , ▁answering ▁directly ▁to ▁the ▁Guard ians ▁themselves . ▁ ▁John ▁Stewart ▁ ▁In ▁the ▁early ▁ 1 9 7 0 s , ▁John ▁Stewart , ▁an ▁architect ▁from ▁Detroit , ▁was ▁selected ▁by ▁the ▁Guard ians ▁to ▁replace ▁a ▁com at ose ▁Guy ▁Gard ner ▁as ▁the ▁backup ▁Green ▁Lan tern ▁for ▁Jordan . ▁When ▁Jordan ▁res igned ▁from ▁the ▁Corps