I guess the short answer is that if you kept a snapper with another species like a RES, map, or painter, the snapper would be a much more agressive feeder, and you would have to overfeed him to make sure the other turtle got any food. This would make the snapper grow WAAAAAAAAYYYYYYYYYYY faster than an inch a year. Prolly more like 3-4" per year.
It would soon be in a position to kill it's cagemate for sport.

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