A crested that eats lots of crickets but not very much CGD will actually not be as healthy as one that eats more CGD and less crickets. CGD has a lot of nutrients that crickets don't have, even if they are dusted so it needs to be the main source of food. A gecko that eats mainly crickets will likely become vitamin and calcium deficient.
How much difference in size is there between these two geckos? If you have a gram scale and can weigh them that will help.
Sometimes one gecko will dominate another whether it means to or not. You may not notice any fighting or interaction that would imply a dominance issue. Most of the time it is simply one gecko getting to the the food first, getting a preferred spot in the enclosure, etc. Because of this the other gecko will fail to thrive and will become noticeably smaller in size because it is not growing at the same rate as the dominant gecko. The only fix for this is to separate the less dominant gecko, allowing it to catch up. Most times once the geckos are fully grown they can be placed back together with no problems.
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