In many respects, his career could parallel that of Philip Rivers, in the sense that they both put up great numbers and made the playoffs annually but never made the Super Bowl. Rivers was blocked by Brady, Manning and Roethlesberger and Allen has Mahomes and Bo Nix (??)) as his white whale.
Of the top 17 guys in career passing yards, only 2 never made it to the Super Bowl, Rivers and Carson Palmer. With 30K yards, Allen is on his way to joining the club.
* I'm not comparing toughness, Rivers get pluses in my book for playing in the AFCCG with a torn ACL