If the top 3 are unavailable or not prepared to fight for the purse offered I can't see why AJ should get stick though I'm confident he will.
If he's not fighting Wilder or Fury he will get stick regardless. Indeed, if he's fighting Wilder in the UK, he'll get stick, because people will say he should go to America and 'prove himself' rather than stay at home. The same people saying he should be fighting Pulev or Ortiz now rather than Miller will be the same people who will moan if, next time, he fights Pulev or Ortiz. The same people who, had he said 'I'm fighting Pulev next' as soon as he beat Povetkin would have moaned that he was avoiding Wilder or Fury. These by the way all believe the obvious way to conduct business at the very highest echelon of professional boxing is to have the fighter ping an email with an offer on it, and of course, no contract to ever appear. In short, these people live in terrible fear of the possibility that Joshua may, one day, have beaten Wilder, Fury, Usyk and whoever else, and retires unbeaten, unified and loaded. Though they'll still almost certainly moan that he ducked Nathan Gorman.
He's ducked his way to knocking out the same guy who represents Fury's best win, as well as signing to fight and/or already beating the Boxrec ranked 4th, 5th, 6th, 7th and 9th best heavyweights. All this in less fights than both Wilder and Fury.
You've been repeatedly asked about this claim, but have ignored it. Unless you can provide a source for this it would appear that you have made it up.