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Okay, let's complete the Water Rook Army. Jeremy's point is appreciated that Dabbabah-Rider is a cousin of Land Rook and Water Rook. However, the new piece-types under scrutiny are sliders and not riders.  
 The intention is each reaches 1/2 the board, one all the white squares and other all the black, as Rook-counterparts to dark and light Bishop, who also reach their separate checker-correspondent halves of the ancient 64-square board. There are different mechanisms to complete the wanted piece-types to be valued near or over the already-established 3.0 for the two differing Bishops (Notice 3.0 is a preset target to complete a 31-point army). The correction now is Water Rook slides one as Ferz to a white square or instead slides any number as regular Rook to white square. Land Rook slides one as Ferz to black square or rather slides any number as regular Rook to black square.
That way each reaches their mutually-exclusive 32 squares and can be seen as separate p-ts comprising together the complete Rook of 7th century to date (minus the heuristic/simplistic ferz one-step). That is all: a complete practical new C.D.A. like we used to do frequently and a thought experiment how both Rook and Bishop separate out into their two different component piece-types.  
Bishop can be regarded as Ferz-rider and Rook as Wazir-rider. All other so-called riders are less appealing to players. As a general rule, Riders formed
from leapers are too limited in arrival squares.
So, instead of riders, or as that above technical Wazir-rider, the Water and Land Rooks slide like a Rook with their opposite restriction on arrival squares. They could as well appear under other thread ''Piece-types,'' where M. Winther's comment happens as the last, http://www.chessvariants.org/index/displaycomment.php?commentid=26403.  Actually however, Water/Land Rook becomes radical enough C.D.A. force. Frankly a fatal flaw for orthodox-schooled players in most C.D.A. force match-ups is having 10 or 11 p-ts to keep track of. Seven or eight are far better for strategy in actual play, and future C.D.A.-type efforts are likely to evolve accordingly -- the very opposite of what Jeremy Lennert touts.  Immortal AntiClerical and Water Rook are now C.D.A. experimental line-ups along with other specific 31-point forces, exclusive of Pawns, numbering 45 or 50 as of the present moment.
Http://www.chessvariants.org/diffmove.dir/augmented.html -- several places in articles Betza says there are already thousands of Armies to choose by enumeration, such as at the end of above Augmented. The 45 or 50 total noted for C.D.A. are rather more developed as Betza's own in articles and others' from comments.