re: SCOTUS isn’t going to mess with immunity

quote:

---

When they define the party eligible for indictment

---

When do they define "the party eligible for indictment" or discuss eligibility specifically?

quote:

---

Who else besides someone convicted by the senate would this apply to?

---

The entire clause is written from the POV of conviction to show the distinction between the impeachment-removal process and criminal process. It's much more effective and efficient that way, as the Senate "conviction" is the only act in the removal process that has any actual effects.

The problem is that you're using to to imply, without any evidence, an exclusivity and association. Your analysis requires a lot of words not in the actual constitution (see above, where you fill in a gap of lacking language by using other language that does not exist in the document)