Usually we wait until after a fighter's career is over to rank him all-time, but these days we have more information than in days gone by about fighters, so we're in a position to make a reasonable estimate about how a modern fighter would have done against the old-school. Given the fact that AJ and povetkin have unofficially seceded the #1 spot to wilder, this is how i rank deontay among HW atg.
1- Tyson
2- Ali
3- Lewis
4- Holmes
5- WILDER
6- Foreman
7- Louis
8- Frazier
9- Liston
10- Johnson
Also, bear in mind wilder's ranking can/will go up or down depending on what happens over the course of his career.