Kasai
Smash Journeyman
Again, I'm going to bring up a few points:
Gimping
There is, according to the logic you showed, a single ring of space surrounding the edge, from the underside only, that Lucario would be susceptible to an edgehog. Any closer, and he could curve/make it by simply aiming for the stage, any further away and he simply wouldn't make it at all. As far as I have seen and witnessed while playing, this doesn't happen very often. Regardless of how easy you think Lucario is to gimp, it simply isn't happening nearly as easily as you are depicting.
Killing
Lucario doesn't need "high" damage to kill people effectively. Let me say it again. Lucario Does Not Need High Damage To Kill People. It is true that at extremely low %s, he has very weak knockback but what people don't understand is that even at 50%, he can kill fine. A sweet spotted Fsmash/Dsmash or even an offstage dair is enough to kill light characters at quite low %s. It is not as big of an issue as you present it to be. Also, as safe as GW's moves are, there is always going to be a chance or mistake for Lucario to use aura sphere.
By the way, on the account that you so willingly point out that I have "lack of experience" with this matchup, it sure doesn't look like you have very good experience. Lucario DOES get aura boosts when he's behind in stock. It's been tested and proven. Don't believe me? test it yourself.
Uair Stalling
You explained how it's punishable for Lucario to air dodge through/DI to the ledge. What about DI'ing completely off stage? Also, since the move does have hitboxes, the ability to counter might be an option (I haven't tested it and can't atm but it might be a viable method to get out of uair spam).
Also, you didn't answer who these "numerous mains" are that you play against. With the amount of experience that you're flaunting, it would do your argument well to at least somehow show that they aren't completely incompetent. I'm not insulting them in any way but I would at least like to know that you have experience against a Lucario who knows that they are doing.
Gimping
There is, according to the logic you showed, a single ring of space surrounding the edge, from the underside only, that Lucario would be susceptible to an edgehog. Any closer, and he could curve/make it by simply aiming for the stage, any further away and he simply wouldn't make it at all. As far as I have seen and witnessed while playing, this doesn't happen very often. Regardless of how easy you think Lucario is to gimp, it simply isn't happening nearly as easily as you are depicting.
Killing
Lucario doesn't need "high" damage to kill people effectively. Let me say it again. Lucario Does Not Need High Damage To Kill People. It is true that at extremely low %s, he has very weak knockback but what people don't understand is that even at 50%, he can kill fine. A sweet spotted Fsmash/Dsmash or even an offstage dair is enough to kill light characters at quite low %s. It is not as big of an issue as you present it to be. Also, as safe as GW's moves are, there is always going to be a chance or mistake for Lucario to use aura sphere.
By the way, on the account that you so willingly point out that I have "lack of experience" with this matchup, it sure doesn't look like you have very good experience. Lucario DOES get aura boosts when he's behind in stock. It's been tested and proven. Don't believe me? test it yourself.
Uair Stalling
You explained how it's punishable for Lucario to air dodge through/DI to the ledge. What about DI'ing completely off stage? Also, since the move does have hitboxes, the ability to counter might be an option (I haven't tested it and can't atm but it might be a viable method to get out of uair spam).
Also, you didn't answer who these "numerous mains" are that you play against. With the amount of experience that you're flaunting, it would do your argument well to at least somehow show that they aren't completely incompetent. I'm not insulting them in any way but I would at least like to know that you have experience against a Lucario who knows that they are doing.