Well they should be. Tyson Fury is fighting another Tom Schwarz in the ring who even though is undefeated and has a high KO percentage they still haven't fought a world class boxer bottomline is Tyson Fury is the one who will baptized them in the ring. Wilder on the other hand got lucky that Dillian Whyte got suspended for using performance enhancement drugs into his previous fight so he removed his mandatory fight against him, now Wilder will be facing another boxer who isn't in the top five to prove his skill. Still doesn't prove how this kind of contract agreement work on both parties since I know bouts are always scheduled one at a time only not unless they are just talking about a non-binding verbal agreement.
Why do you say Wilder got lucky Whyte was suspended? Don't you think Whyte would have got destroyed either way?
Also, who else would Tyson fight? He can't exactly fight AJ, Ruiz or Wilder? He's leagues above practically everyone else left. He would just be fighting someone else's leftovers, e.g. Takam, Parker or Povetkin.