Except that it was Radahn who fought Godrick and ran him off to Stormveil. It wouldn't really make sense for Radahn to defend a city he already tried and failed to conquer. Especially if you consider that if that were the case, Morgott would still be there and Radahn wouldn't need or probably even want to help him in any way.
Yes but the point was that Morgott directly took the field only once and saying he did for Godrick means he thought it was necessary to personnally intervene for a pathetic excuse of a demigod with poor strategic skills, which makes no sense. So if he was personnally involved in the First Siege above the Second, then the first was from Radahn.
There's really no indication that Malenia or really ANYONE knew where Mohg was at the time. Also the only two known entrances to Moghwyn palace are both in the Consecrated Snowfield which she would have had to pass on her way to Caelid.
So far, no one had even attempted to invade or attack the Haligtree, there was no reason to think that Miquella would really even need Malenia to defend him because there was no need to at the time. This is especially so if Miquella sent Malenia to kill Radahn in order to stop him from keeping the Stars halted.
Nothing says she didn't at least got some informations or knew something that led her to . Again, she went from the Haligtree to Caelid, which are completely opposite to each other in the map, and fought Radahn in a location that is
exactly above the very specific place where Miquella is. This is way too significant to just be a coincidence, especially with Fromsoftware where every little tiny item tells a story, so obviously something as glaring as this has to be significant. And literally
nothing in the game supports the idea that Malenia is a thrill seeker blood knight seeking challenge just cause why not. In fact, this description actually fits Radahn himself, Malenia for her part is simply devoted to her brother, to the point she followed him in his plot for the Haligtree, defying the GW, and didn't care about glory. All she cared about was 1) protecting her brother and 2) restraining the Scarlet Rot. And again, this is more about feelings than defense. Malenia and Miquella are clearly extremely close, with statues of them depicting embracing each other, she's utterly devoted to him to the point she abandonned her shot at succeeding Marika to follow him and let him lead his own land. Putting the two and two together, with all we know about Malenia as a character, her devotion to Miquella, her lack of interest in glory including from battle, the location of Mohgwhyn and the Swamp and Miquella being exactly under the very specific spot where Malenia and Radahn fought, Malenia having somehow accessed some clues about Miquella being near Caelid is literally the ONLY logical reason for why she would do all of this.
Miquella sending Malenia like some general would send a soldier doesn't fit his character at all. The guy is all about being nice, peaceful, open-minded and willing to defy the Golden Order, Marika and the Greater Will itself to find a way to cure her and protect anyone who needs it, including and especially people who were persecuted. He's not a general or a military, his exploits in Magic are all based on creating new stuff and researches so even discounting his peaceful nature, he literally has zero military skills.
Yes, and the Haligtree was not fully grown yet meaning they had yet to free themselves from the Greater Will. The only way they could have done so was if the Haligtree had become an Erdtree which it had yet to do when Mohg kidnapped Miquella.
Yes, and? Miquella still had the means to make it happen, all he needed was time to power the Haligtree. That's why Mohg kidnapping him throws everything into shit, the Haligtree needs Miquella to grow, and it's not something that can be done easily. As for the Greater Will, its influence is limited to their chosen champion and the Two Fingers. Marika was too busy plotting the Shattering and getting tortured by the Elden Beast and Malenia and Miquella don't seem to have a specific set of Two Fingers, which are the only one aside from Marika who can directly interfere with the life of people.