LOL - 9? Nice big litter. She will be able to nurse the kits ... if you get a chance, when they are older, you will see the kits move from teat to teat as they nurse ... wriggling about on their backs.
In the first litter, the buckling probably isn't fertile yet, but this is dominance behavior and shouldn't result in an oopsie litter. However, if it is this precocious at this age, I think you will want to consider seperating him to his very own cage by 12 weeks. An oopsie litter is definitely possible at that age. You also might want to consider sorting the bucklings and doelings into seperate growout cages about 8-9 weeks of age. If you can do that, the precocious buckling should ease up on dominating the others for a bit.
Well, as for the doe preferring the oats to the pellets, yes, it is like women and chocolate ... a little isn't "bad" for you, but a lot is very bad for the hips :cheesysmile: While my does are nursing a litter, I feed 2/3 cup of oats per day in the winter (sub freezing temps here, so more energy is needed). I also supplement all my rabbits with 1/3 cup of oats in the winter here, but in your neck of the woods, I would think that 1/3 cup to nursing does would be plenty. You are increasing her pellet ration as the kits get bigger and she produces more milk?