HU, preflop, any two cards are 'good'... (for much more detailed, great analysis on this see harrington on holdem, vol 2, the headsup chapter....and while ur at it, read the rest of vol 2 and get vol 1 as well. ull thank urself later!)
anywho, all that being said, and im not in any way, shape or form pretending to be 'all that', but i would have also "just" called if i were danneman, instead of going allin on a draw heads up, trailing some 2.5-1 in stack ratio.
there would have been another opportunity down the road. HU postflop most made hands are already monsters. (hachem's of course was an unbeatable super-duper-monster).
conversely, draws, even OE straights (or 4-flushes), are deadly if needlessly overplayed/overbet unless of course one is on their last few chips, which danneman wasnt at that point.
again, as always, just my two cents.