25...Nc7 was the planned move here with the following variation in mind: 25...Nc7 26.Rb8+ Kh7 27.d6 exd6 (28.Rb7 Ba4? i think?)I'm sure I had more, I'll have to find it.
But to be exhaustive I've decided to try to analyze moves I don't trust. One must be fair:
25...Kh7 (this move makes sense, we'll probably have to make it anyway) 26.Rb7 Nc7 27.d6 exd6 and we've reached the above line but lost a tempo (white didn't have to play Rb8). Now this may not be best for either side but it seems this is enough reason not to play Kh7 right away.
25...Nd6 (this move appears logical) 26.Rb8+ Kh7 27.Kb1 White seems to be solving his problems 27...Ba4 Rd2 I think our pieces are placed great, but we're running out of ways to improve them while White's position can continue to improve. Mostly it just feels like we've lost our initiative. Here's another line with more initiative:
25...Nd6 26.Rb8+ Kh7 27.Kb1 Nf5 28.Nxf5 Bxf5 29.Rc1 Be5(Rxh4 directly also)
pawns are falling. Can we draw it?
How about that a-pawn? It seems to be falling in our variations, can we save it? I'm not sure what would be better: a5 (gives us the b4 square) or a6 (gives us the b5 square). I don't want to look at both so I'll consider a6 since it restricts the knight and maybe gives us another place for our bishop.
25...a6 26.Rb8 Kh7 (Rxc2 is probably another move) 27.Kb1 (Rb7, Rd8 other tries) Nc7 This line(lines) doesn't look too bad, I haven't analyzed all variations though because I don't believe in it. Moving a rook-pawn in this position just feels like a bad idea. Maybe the move has some merit though and if anyone makes arguments for it, I'll put some more effort into looking at it(this includes 26...a5 as well).
25...Ba4 I have to look at this move, I've felt that this bishop should be on a4 almost the entire game, but there hasn't been time to move it there yet, so is now the time? 26.Kb1 Nc7 27.Rb8+ Kh7 28.Rc8 I'm not sure where to go from here yet; lots of tries.
Anyways, this is just a pre-analysis; for a position without queens it remains complicated. For a non-concrete argument though, our knight is our worse piece and c7 seems the best place for it.