BenjaminNicholas2 said: "Sure, gay guys are gonna drool to see him, but that doesn't make him a suitable Seymour."
That's maybe even the biggest reason why he's miscast. Gideon is cute as hell, don't get me wrong, but he's not a conventional choice for a typical leading man - which is what's so special about Seymour. Seymour is written for the fat, nerdy, balding, big featured, big voiced men who can give a leading performance but never get the chance to.
Seymour is not a Clark Kent, take off his glasses and he's gorgeous type of character. Casting Jonathan as Seymour is sorta like casting him in "Significant Other" - it really, really doesn't work. But it's not going to stop a gaggle of horny gays from choosing him if the alternative was someone like, say, Grey Henson, Larry Owens, or Gideon Glick. (Just to give a few varied options on who fits into the Seymour type worlds better than Jonathan, who I love, ever could.)
Anyway, yay Gideon!!!
They/them.
"Get up the nerve to be all you deserve to be."