GhostPeon

I am saving that little tidbit for later

Removing Buggy's nose would be like cutting the horn off of a unicorn

I do have special plans with Buggy's lineage, and I want to take some liberties with his rather unexplored backstory. But I can't give any spoilers now.

He already is, wdym

Zoro not choosing to cut Monet doesn't mean anything. We already know that a true swordsman's blade only cuts when he actually wants it to. It is fair to say that a blade being covered in haki doesn't necessarily mean the owner wants to cut someone, but Mihawk attacked Buggy in an active warzone and literally diced him to pieces.

I do plan for something similar to Shrine, but only after the devil fruit awakens. There's still plenty of time before that happens.

Doflamingo is a pirate that has attacks spanning entire islands. The highest feat Buggy has showcased up to this stage is cutting a big area and causing the collapse of a palace. Doflamingo has good mastery over three types of Haki. It is just an unfair comparison to make for our MC at this stage. He's barely started dipping his toes into that world, and he's faced by a Yonko Commander-level threat.

Four Urouge? Technically yes. Buggy can just reattach his arm when he finds it.

From what I know, Kaku and Kalifa get their fruits later on; Lucci should already have his, same with Jabra (although he will not be making an appearance)

I hadn't checked this in canon; I'm not sure if this is mentioned. But I thought it was very unlikely for Garp to remember who Buggy was from Roger's crew, since he tended to stay out of the way during large conflicts.