Pull on a brownish leaf, if it comes off easily, yes, probably bud rot starting.
Looks more like late season colours due to cool night temps to me., apart from some deficiencies.
Unfortunately, by removing so many leaves, you really have hamstrung your plants ability to make enough energy to grow nice big flowers.
The fan leaves are the solar factories that power your plant.
Less leaves = less energy being made = less potential growth.
It really is that simple......
Besides, if your plant would not NEED those leaves, it would not grow them in the first place!