
No, Manwë had power scarce less than Melkor, but Melkor lost a lot of his power in the dominion of Arda, for he put a great deal of his power into the fabric of Arda as Sauron did in the Ring.
Gothmog was slain by Ecthelion, an elf in Gondolin and he was killed in the same battle.
The Mouth of Sauron is a black Númenorian who has forgotten his own name over the span of time.i believe he was named "the mouth of Sauron" aswell
Right off hand I do not recall anything in The Silmarillion that states that Ecthelion was a Noldo, but that doesn't mean that it isn't in there.