Blimey! The Imperials become chatty in triumph, don't they?
Ok, first of all, no, Vader did not take your squadron, Ulrand. He left you just enough to enforce the blockade, though not actually enough in your opinion.
The reason he did all that, btw, is because you and Coll both told him outright how very confident you were of victory. So his mindset is Well, if it is that easy, they won't mind me taking the ships then, will they?. A lesson there, I think.
As Coll will be in charge of the actual invasion, it seems more relevant for his Commanders to stay with him for that particular mission.
Lyle didn't really get started as far as I am aware, but there is nothing to stop you bringing Rylis in with you, no.
The weak points in the walls are the gates. No way of getting around that. If there is a way in and out the wall it can't possibly avoid being weaker than the rest.
Janthis does raise a very relevant point about having to get OUT as well as in. Especially with a time consuming task like subduing Drakkon. Doubly so with suspected Rebel elements around. Atar's main worry is that if the shuttles have to hang around, they'll become easy targets.
I cannot say more about the Lodge than I already have. The interior is open and not built like a fortress, but getting up there is very hard; it is basically suspended in mid-air and only accessible by narrow walkways. Incidentally, Lanzar anti-air is relatively feeble but that which they have is all by the Guild Hall.
Vader stated that Andran is a Rebel and must be caught as such.
It's very hard to bring ANY troopers to the Guild Hall without attracting attention. But when Melkor goes, an entire Company can go with him.
It's a large and varied Galaxy so nothing is ever for certain, but to the best of your knowledge, nothing can knock out an Osokan. In fact it's so damn difficult to kill one, what you would normally call killing someone with extreme violence tends to have the effect of merely subduing. The one thing you don't need to worry about is an excess of effort, at least on a personal level. It changes if you were in an AT-AT, for example.
Lastly... well, this is the problem with employing Scum like these people, Melkor. No sense of decency in conversation.