Well how obscure are we wanting to get here? I've still had levels of surprise from each tour, for example I didn't really expect 6:00, TGD or TLF to show up in the 2011/12 tours. Not that I was at any of the shows but that cover they did musta been pretty unexpected for those that saw it.
As for the following tour, no one coulda seen TSF or SDV coming (until the surprise wore off from the static setlist I guess). And I feel a few songs like Scarred and ToT were not necessarily expected songs either.
The quick 30th tour? Afterlife and BMS were pretty obscure, not to mention the sections from ACOS. And then we got BTV.
I guess my point it DT still seem to more or less try throw in a few surprises on their sets. Another tour separate from an album release would be an obvious chance to pull out songs like ACOS and Octavarium again but hard to say if we'll ever see the likes of Don't Look Past Me or any Majesty or b side album demos again, that might be too obscure at this point.
I mean come on, the last tour had Space Dye Vest + a few others from Awake that haven't been played in ages, plus Trial of Tears and the Shattered Fortress. There were plenty "lesser played songs".
Okay beat me too it.