Ah yes, I think I saw it, and wanted to save it for when I had the time to read. This whole 'working full time' business is terrible for my fic reading!

And as for outright nods then I'm not sure. Although Harold Saxon/the Master could also read as Kurtz. (And looking back, then I watched The Lazarus Experiment at the beginning of March, so it's been ticking away for a long time. Mmmm.)