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How integral were these two to the X-Men story/plot? It seems a lot of stories revolve around them, and their actions in effect decided both past and future outcomes.

How important are they? It seems very.

very much so. you can read all about it here--

http://www.mutanthigh.com/bishop.html

http://www.mutanthigh.com/cable.html

what do you mean by 'the x-men story/plot'? do you mean to foundation of the x-men as a whole, or just what place have they had with the team throughout the years? if it's the first, then i can tell you it was cable who outfitted xavier with the technology to build the original danger room and cerebro (cyberno,) and bishop ultimately prevented xavier from dying after a couple time jumps during the AoA crossover. if it's the second, check out kohl's links.