Have to say I'm totally fine with the Ed route not being implemented, partly because it's hard to top Arthur in GGGB and I agree Seymour doesn't come close, even though Seymour is meant to fill some of the same daddy-issues story, if you want to play Lena that way. (I'll add "yet, at least" because I'll reserve final judgment on Seymour until I see Eva's plans for how he will make both his Lena and Ian puppets dance.) And if Seymour can't, so far, give Arthur some competition, Ed certainly cannot.
I can see where Eva was going with the setup for Ed and Molly - someone already mentioned that Molly's illness could open up an Ed/Lena route, and that makes sense. It could be an affair if Molly is in the hospital and Ed and Lena have to run the cafe, it could be a relationship if Molly dies and Lena and Ed get close emotionally, it could also just be a pity fuck or two on Lena's part in either scenario as well, depending on a player's version of Lena.
But the second reason I'm fine with an Ed route not happening is frankly that his personality, especially in the early part of the game, is just a less-incel version of Stan. They're both awkward, nervous guys who have boundary issues and can do versions of spying on Lena, and versions of making her uncomfortable with these passive-aggressive attitudes towards her. IMO they basically serve the same function for Lena's early story, the differences only being age, and one's in her home life while the other is in her work life.
You can say there's a degree to which all Lena's non-Ian options have some of these traits (and I'd largely agree) but only Stan and Ed have that milquetoast creeper vibe that's basically laughable. Robert is pathetic but can be a real threat with Lena's restaurant job - and there's for sure a subset of players who enjoy having Lena toy with him sexually and emotionally, just to watch him squirm. Axel can't handle Lena leaving him and aims to control her only slightly less than Seymour does. To Jeremy she's a trophy the way any girl is to Jeremy, to boost his own self-esteem. Mike gets off having her as "the other woman" and clearly can't form meaningful emotional attachments.
But Stan's just a laughable pervy young man, and Ed's just a laughable pervy old man. No sense giving both of them sexual content with Lena. I'm sure some here would say there's no sense in giving either of them sexual content with Lena, but that's a can of worms for another day...