Is it possible that this seamont is a recent formation?
I'm not a geologist, nor do I play one on TV. However, I have to believe that it is possible, if not likely.
There are incidents on record of Volcanic formations growing thousands of feet in a very short period of time. However, for something to have appeared in what was believed to be 6,000 feet depth of open water without causing enough of a disturbance to be really obvious just doesn't seem likely to me.
Then again, we still haven't viewed this "sea mount" since the incident, so far as I know. The following scenarios played out in my head a few days after the incident:
Maybe a really big space ship landed and it decided to hide in deep enough water so that it's top would be just below the surface.
Imagine, if you will, the Supreme Commander of the Grnak deep space cruiser SNRF Lookithat, explaining to his Overseers why his mason detection dome is crunched in so bad. "You chose to park your cruiser in the path of one of these primative Earthlings warships? You know that your career in the Anti Matter Space Fleet is finished, don't you Mister?
The other thought that crossed my feeble little mind was some pod of whales with one very bruised adolescent. The older whales keep saying "I told him not to play with the humans, but noooooooo! He had to try and cut them off before the thermocline! Keep doing that and he'll never grow up to enjoy the trips to Hawaii!"
I know. I've got way too much time on my hands.
The short answer is not bloody likely! The other S.F. threads contained a lot of input from knowledgeable folks indicating that this seamount didn't 'suddenly' appear... whether from the Sumatra quake or any other geological event. It's been there a long time, although it may have been undetected or imprecisely located until the grounding of the S.F.