seed size is a good way to tell the size of the calyxes it came from, thats why sativa's with there small but very special calyxes produce small seeds and the well known indicas have big bulging calyxes wich produce those big seeds...if your making hybrids id suggest trying to find the plants that will give you the big calyxes (seeds) this does not make it sat or indy dom on its own...its just a selection one of many, you can also find indy dom plants that have been selected for skinny leaves like female seeds NL, and vice versa, you can find sat dom plants that have indy specific geneomes...so in short seeds dont mean much except an idea of what size calyx it came from, as for the tiger stripes its strain dependant but at the same time if your plants will make the tigerstriped seeds they will need to be fully mature seeds to do so, like busting out of the calyx mature, not 3 weeks should be enough time for most plants and then you get some pale, light, or even underdeveloped beans with some mature seeds that couldve gone a little longer...IME they are not special though tiger striped or solid color, it means more that there fully mature