Sorry but I did not understand your post

1) Then why are you telling me? Tell it to King.
2)And how could he do that if his men were lying dead in the streets of the Imperial City? The ones alive were too tired to keep on fighting.
3) Agreed, But Mage stated earlier that The Legion won't have to occupy it again. If they separated peacefully then they could co-operate with eachother. Although I don't think two different factions can fight together peacefully.
4) Stormies believe Ulfric is both. Politician and Warrior.
5 and 6) Can't argue with you there.
The Empire needed peace to gain it's strength, many of the Legions could of been fighting every day for four years. There would be many wounded, Legionnaires and Civilians alike, the Legions in Hammerfell lost quite a few of their number in the March of Thirst, where they had to march across the Great Desert. Hundreds would of died from that alone. The Legions did do well in the Great War as it is noted in many of their battles. Hammerfell Campaign was actually doing wonderful in the later part of the war, General Decianus was about to push the Aldmeri Dominion back all across Hammerfell until he was ordered to return to Cyrodiil, where the Battle of the Red Ring took a large toll on the Legions.
While many Stormcloak supporters argue the Empire lost the Great War, and that the Legions are weak, they are greatly mistaken. The Legions did exceptionally in the Great War, when they were able to mobilize for attack they held their own, even keeping the Aldmeri from advancing any further in some cases. What would of been the main losses was that during the Battle of the Red Ring, it wasn't an open battle. The Legions were assaulting the Imperial City itself, the Aldmeri had occupied it for nearly a year. So it would of been a battle for every inch. How the Imperial city is constructed, each section of the city contains a large gate and is walled. It would of been like besieging several forts. Every time you breach a gate and take control of part of the city, you would need to breach another heavy gate, and another and another. All the while the Altmer Mages and Bosmer archers are firing into you.
I would say in the next Great War, the Aldmeri Dominion will have something coming to them. The Empire may of been weakened than it was two hundred years ago, but even a weakened Empire managed to fight a strong Aldmeri Dominion to a stand still. That alone speaks volumes.
The issue of the Legions attacking Skyrim is, they can't risk their defenses against the Aldmeri Dominion. The Empire see's the larger picture, the Civil War in Skyrim is nothing but a side show, a distraction before the main event against the Thalmor resume. If Skyrim left the Empire peacefully then there wouldn't be any issues, Skyrim would still be an ally of Cyrodiil, order would be good in Skyrim, the Legion stepped in to restore order. What Ulfric does however is execute Tullius after his surrender. That itself could spark a war with the Empire.
The difference between Ulfric's rebellion and if Torygg left the Empire peacefully, Ulfric's rebellion is Thalmor doing, they want the Stormcloaks to attack the Legion and divert the Empire's attention away from the next Great War. Ulfric is a Thalmor asset, he is doing exactly what they want. Raijin will sometimes argue that the Empire should seek peace with Ulfric, but that's like saying Ulfric is a man of peace. It's a stupid argument, like many other Stormcloak debates in this thread. That unwilling to see the larger picture, and making Ulfric out to be something he isn't. He started the war, he brought the bloodshed, there is only a threat to the citizens of Skyrim because of Ulfric.