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Note that there are several rule variants of Tenjiku Shogi. The wikipedia article tries to describe what most likely have been the historic rules. But these are not the rules according to which the game is usually played today (e.g. on the gamerz.net PBeM server). And neither of those are the rules on which Colin Adam's book was based.

The major differences between the rule variations are (1) whether jumping generals are allowed to jump-capture jumping generals they are not allowed to jump over (Colin: no; Wiki, PBeM: yes) and (2) whether jumping generals can deliver check while jumping (PBeM: yes; Wiki, Colin: no).

The Jocly version uses rules similar to PBeM in this respect. Where there is controversy over the moves of some of the less important pieces, the Jocly implementation follows the Wikipedia.

You mention a weakening of the Fire Demon that fully burns, but has a less powerful move. It is interesting that the historic move of the Fire Demon already is a step in that direction: instead of a vertical slide (as used by PBeM and Colin) id has a sideway slide. This makes it significantly less dangerous in the opening.