In recent Christmas special episode of Doctor Who Twice Upon A Time,
The Doctor sought help from a good Dalek. We learned in the episode that normal Daleks wanted to destroy this anomaly. They sent armies upon armies for thousands of years, but failed to kill one Dalek.
How did that one Dalek achieve a feat which the entire Time Lord race had had a hard time with?
Let's say, that good Dalek could anticipate every moves of his enemies as he had access to Dalek hive mind, the reverse is also true. Others could anticipate his moves, too. So, I don't think this is the case.