re: Ladon Vallis & Cape Timiris analog of meander cut-off.
In my opinion, Marcia, that's not a channel and a meander, but a tectonic trough (a fault valley) and an impact crater next to it.
The valley is too straight, it doesn't loop and wiggle enough, and it doesn't blend-in to the circular feature, it just sideswip[es it and goes past. There's some sort of linking element, but I think you're backing the wrong horse here. (or better, this is the wrong racetrack).
Other areas on Mars have better meanders - look at the delta in Holden North, or Nanedi Vallis...
Would a CDO2 flow do this? Nobody knows, 'coz nobody's done the proper work. I admit I'm just arm waving when I say it *could* work, but so is someone who says it *couldn't* work. It needs proper scientific work i.e. time and money...