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About R vs C=(RN) and A=(BN) you are again correct. KQKR is generally won
(99.4% wtm, 46% btm), but KCKR is in general a draw (84% won with wtm,
1.6% btm), and so is KAKR (63% won wtm, 3% btm). It might sound strange to
descibe an endgame where 84% of the positions wins with wtm as generally
drawn, but the won positions are almost all positions where you either
immediately capture the black King (36%) and a very similar number of
positions where you capture an undefended Rook. That leaves only about 15%
of the positions (there is some double counting), and most of those are
positions where white can give an immediate fork or skewer. Normally, you
would not consider any of those positions as KCKR, as it is obvious that
the Rook is tactically doomed from the very start. If you can't gain the
Rook in on or 2 moves, it is almost always draw.

A Bison loses against any of Q, C and A. KAKBi is 98.3% won with wtm, and
52% with btm. The others do even better.

All this on 8x8.