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When producing concept art, our artists believe in providing a variety of options for any given subject. A single concept rendering would place too strict a constraint on the resulting game design. As gameplay is worked on and refined, having several concept renderings available provides much needed inspiration and raw material to work with - it lets us turn visual designs into tools for widening game interaction possibilities.
In the case of the Flare Gun, the concept artist provided the team with a number of different designs - various combinations of size, shape, color, and even visual functionality. The final weapon implementation was a result of concept and gameplay related decisions, honed and proven effective through playtesting and further interative design.