Why is WWE ignoring the fact that HHH and Taker already had their Wrestlemania match?

Undertaker didnt even say to hhh that i have beaten u u had ur chance and he should of not accepted his challenge. Cena should have been on the match instead or gold berg booker t, the rock theres lots of other veterans who hasnt had a match with undertaker. Maybe Batista should have a rematch with undertaker too next year at wm.