Gwen's death is an odd one, while it looks like fridging, her death was only there so Conway could make Peter end up with his redhead waifu, so, it's another cliché.
I mean, original meaning of whatever stuff has matters little, words and terms are not static, and they can't be, fridging nowadays is arbitrarily defined, it's basically only used for people to whine about a character being killed.
The trope that describes Simone's original meaning the best is "Disposable woman" anyways, fridging became something else, something very poorly defined, but hey lol.
Funny you mention Aerith, her death had basically the same reaction from the fanbase and writers as Gwen's, to the point both are stupid enough to think she was a saint, when she was anything but lol.The fact that you can't see the difference between the deaths of Alexis and Aerith, Aunt May or the Waynes just goes to show you don't love "fridging." You don't even understand it.
Alfred is dead? Man, he's the best Batman character...
Even if he was put in a coma, it could still be seen as fridging, 'cause again, the way TV tropes defines it says that another character is made to suffer, not necessarily killed.If Uncle Ben had just been injured or put in a coma instead of killed the shock would have turned Peter to a very similar path he is on now.There was no need to kill him off.
Kyle debutted in January 1994, by that time Maximum Carnage had already happened, and in July of that same year Clone Saga would start, and a month later, Alex gets fridged, whatever **** Venom did with MJ would already have happened at the time.And your Major Force thing was done by Venom to MJ, which may have been retconned to actually physically hit her but either ways.Not sure which came first anyway, just saying if it came later it would be a copy.