With that said, I might be reading too much into Bosk's "Interesting" comment at either TDEN or TMW/FT being the opener. Previously in the thread, he also said "Interesting" to Scarred, Finally Free or The Great Debate. And confirmed that BAI would be "an unexpected, yet cool opener". IT, TSCO, and were also guessed as the opener, but no comment in response from Bosk.
So he might be trying to throw us off.
He did say that the opener was a "monster" track though. But not necessarily a mega-epic. The only songs with "Monster" in the lyrics are TDEN ("monstrous"), TITL ("cast off the monsters inside"), A Tempting Offer ("You monster, leave my son alone"), A Fortune in Lies ("the heart of this monster creation"), Behind the Veil ("What kind of monster would come to feast"), and Peruvian Skies ("I'm the monster you created"). If it's not this, than it's got to be "monster" in some other way, either due to length, complexity, epic-ness, or heaviness.
We know it's not:
BTV, because BP/STR is the only song from DT12
6DOIT, because it's under 25 minutes
He didn't specifically say Mangini played it, only that it was played "recently," but that it has never been an opener. I suppose "recently" could mean one of Portnoy's last tours, given that DT has been a band almost 30 years.
It's hard to sum up all the clues but we have:
1. Played "recently" - some people are assuming this means MM has played it, but that's not necessarily true
2. "Monster" track
3. Never opened with
4. Interesting as opener; not one Bosk would have picked "in a million years," but not one so obscure as to jump out at him right away
5. It's a "crowd pleaser"
6. Bosk was listening to at 3:58pm Pacific time, the afternoon of Wednesday, Nov. 30, and then listening to another band at 4:23pm, 25 minutes after that, and this is some how a clue, but not necessarily because it was Epica he was listening to after.
7. It's already been guessed, but we don't know by whom
8. Under 25 min. (this only eliminates one song, but it is what it is)
9. Not on I&W due to process of elimination (obviously)
10. Not on BC&SL
11. Probably not on DT12, since we know the only track from that album is BP/STR, which are sort of inconsistent with many of the other clues.
12. Probably not ACOS, because that hasn't been played recently, except for ATTSTA and Innocence, but these don't really fit in as "monster" tracks by themselves.
13. Probably not WDADU or a B-side, because that's unusual enough that Bosk wouldn't overlook it at first
14. Probably not 6DOIT, since TGP and the title track are eliminated for other reasons, and none of the others have either been played recently or are crowd pleasers.
15. Probably not on TA, as very few of those could be considered "monster" tracks, except the "monster" lyrics in ATO, which seems pretty random that they'd pick this song out of everything else on that album
15. Specifically, it's not Never Enough
1g. Specifically, it's not FAS
That's really all the clues in one place.
Either the clues are too vague, or I'm just missing something, because none of those hints really give it away to me. There's a number of possibilities for each one. Someone guessed it right though, perhaps randomly, perhaps not.
I do have to say that TDEN is not inconsistent with any of those. The only one that's a stretch is "crowd pleaser," but I'm not really sure. It has very mixed popularity on this board, but that might just be hardcore fans, and the more general fan base might love it. I've never been at a show where they played it, though, so I can't judge the reaction.
My guess is that it's probably on Awake, FII, SFAM, TOT, Octavarium, SC, or ADTOE. And that it's a crowd-pleasing monster track from one of these.