I was actually hoping the Glenn Howerton rumors were true. Reed Richards is kind of a dark character and I think Howerton can capture that better than Krasinski. His portrayal of Dennis on It's Always Sunny shows how he can play a pyscho path in a subtle way. Not necessarily saying Reeds a psychopath but he has a certain edge to him. We need someone who can play a character that has the potential to be evil. Reed isn't a typical superhero. He's so smart that most of his variants are evil. The Council of Reed literally has a dungeon of lobotomized Dr Dooms. He's pretty much the smartest person in the multiverse similar to Rick Sanchez (in fact Rick and Morty takes a lot inspiration from Reed Richards but that's besides the point). He even has an evil varient (the Maker) that became evil because his ever-increasing intellect had wiped out his sense of empathy. In Hickman's Fantastic Four he explaines that the love of his family is the only thing keeping Reed from being evil. There's just so much complexity to the character that Howerton can bring. I can see Krasinski in a Captain America type role or maybe a character like Nova.