All the grouping does is place the card into a cluster of players, any of which would be pulled at that rate. Take the rate, multiply it with the amount of players in the group and that is the rough “true” odds of pulling any specific player in that group. If you work the numbers, and give a quantity to a players card, you can guesstimate the quantities of the autos and production. For instance, if group A is 1:1000, toss a quantity of 25 to it. If another group has 10 members and a 1:100 chance, they also roughly have 25 cards each. But then if a group has 40 members and a rate of 1:6, you can bet that the quantity will be much higher. (Oddly, off the same, it averages to 4 cards per...that can’t be right, probably closer to 100...but you get the idea.)
...but the again the grouping could just represent certain players and the quantity could fluctuate with the group itself. Gretzky and Yzerman, for example, Gretzky signs 30 cards, Yzerman signs 50...the odds of pulling those 80 would be whatever the ratio is. That is the drawn out difficulty of the unnumbered insert, or auto in this case.