Does wladimir klitchko's legacy depend big time on beating david haye?

wladimir is the ring magazine champ and currently holds the ibf, ibo and the wbo belt. i believe wladimir is also the longest reigning champ for ibf, wbo and ibo. this is something that wont easily be duplicated, he also amassed 49 KOs in 55 wins and despite this impressive resume, some still question his place in the history of the sports,, some question "what has been his most notable win"? will a win against a high caliber opponent in haye solidify wlad's claim to greatness? though personally i believe wlad is one of the best and it is not his fault that he's fighting in a weak era, his domination to me is enough to put him up there, i believe wlad needs this fight, this is going to be his biggest challenge and he needs to win to prove his doubters wrong,, your thoughts please? thanks and y'all have a great day!