I agree with you with everything except that the Wrath didn't receive help. With Baras' master we had a practially immortal sith lord who was hiding his true power. He pretty took down the Wrath's entire power base later on lol.
With Baras' sister and the greatest sith assassin in lore, we had a jedi master to help us. The hero of tython doen't even become a master until he did that thing that Revan, the Exile, and previous wrath tried to do. That puts the power of a jedi master into perspective.
At one point the Jedi claims that it is impossible for the Wrath to beat her alone.
The Dark council help Wrath received came from the sith that can't fight. He helped us take down Baras' unnatural foresight (bound entity).
When it came down to facing a Dark Councillor alone, he was pushed to his limits.