[Neil Jones]

So it's now been discovered that it was Blade and not Paint the last ever 2s ident (the original run), although given that shortly before Blade, the start of the Learning Zone ident appeared makes me wonder if Blade's appearance was a cockup........

I would question whether Blade was meant to be the final ident. Its clear to say from the clip somebody's pressed the wrong button (or screwed up the playout list order) and we should be looking at this:
www.youtube.com 

Depends if you technically count Blade in that context as in "an ident" that was meant to be there. I doubt it. The Learning Zone at that time had its own separate presentation wise from BBC Two. Before 1997 it was wrapped around BBC Two presentation.