Your drawdown probably did no harm, especially if you still have water at least six feet deep. It dropped slowly, most likely releasing the dirtiest water in the pond. You're right on about the fish..larger bass will eat smaller ones. Fish adjust their numbers to the smaller size of the pond, then when the pond re-fills, fish will spread out and have more reason to spawn. I have seen the best spawns ever in ponds drawn down and then refilled.
Another positive is that much of your shallowest water has been exposed to frigid winter temperatures. If you had a problem with excess aquatic plant life, the drawdown will help. Excess plant life freezes and dries. New water will cover the area, and aquatic plants are behind from the beginning.
Since your drawdown was from water flowing out rather than drought, odds are you have done no harm, but have actually helped the pond.
That's my opinion, we'll await others.

Teach a man to grow fish...
He can teach to catch fish...