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I have investigated the theoretical endgame properties of the Mammoth and
it proved to be significantly stronger than the Rook in this area.

(1) M + K  vs. Q + K  = draw
(2) M + K  vs. R + K  = draw
(3) M + K  vs. B + K  = win
(4) M + K  vs. N + K  = win

Comparatively, a Rook + King cannot win against neither Bishop nor Knight,
in the general case. This implies that the Mammoth is stronger in
theoretical endgames. Moreover, Rook + King generally loses against 
Queen + King, but the Mammoth draws against Queen.

Also, in a theoretical endgame, a Mammoth is well suited for escorting a
passed pawn to the promotion square. Bishop, Knight, or Rook, cannot
achieve this.

So it is stronger than a Rook. I contend that it compares to Rook + Pawn,
i.e. 6. But I refuse to believe that it's as strong as an Archbishop (6.8).