This one is not a theory (more like a rant). What is up with Thunderclan and not having kits?
Let's analyze this:
(Series One- List of Queens)
Frostfur- ok fine, one litter of kits
Brindleface- at least 2 litters (Sandstorm in one Ash and Fern in the other)
Goldenflower- 2 litters (Swift in one, Tawney and Bramble in other)
Speckletail- 2 litters (Lion and Golden in one, Snow in the other)
Willowpelt- 3 litters (Darkstripe, then Graystripe, and finally Soot Rain and Sorrel
*Note: there was always at least 2 queens in the nursery (except for the last book)
(2nd Series)
Ferncloud- (the exception) 2 litters (Spider/Shrew and Holly/Larch/Birch)
Brightheart- 1 litter (White)
Sandstorm- 1 litter (Squirrel and Leaf)
Sorreltail- 1 litter (Cinder Mole Honey and Poppy)
*semi normal to 1st series. No repeat queens from 1st series.
(3rd Series)
Daisy- 1 litter (born in the clan: Rose and Toad)
Whitewing- 1 litter (Ivy and Dove)
Ferncloud- 1 litter (Fox and Ice) Only repeat mother from 2nd series.
(4th Series)
Poppyfrost- 1 litter (Mole and Cherry)
Thunderclan is in big trouble. All the other clans where we've seen the camp are having lots of kits. They could end up dying out without kits.
Firestar was brought into thunderclan because there were only 4 apprentices in training (lowest # of paws in training ever). Right now we have two, and after them, 2.