Contrary to the popularity of the bottom deal among magicians,movies,T.V.,forumers who say its the only cheating move a mechanic would need,ect but statistically speaking the unsung number-two man is the most efficient at the card table. Right off the bat,consider marked cards. They are almost completely useless to the cellar man simply because the markings on the backs of the bottom cards will not be in view. The second dealer on the other hand has the back in plain view all the time and can save it for themselves or give to other confederates. Point number 2,the bottom card stays fixed until the cellar man takes it,where as the top card changes continuosly during the course of a legitimate deal. In a seven card draw game of poker he has the advantage of seeing up to thirty five top cards before the draw. the rise in popularity of blackjack through the years in licensed casinos and illegal gambling joints created a demand for second dealers but not so much for bottom dealers who are more or less thwarted in this game by having the burned cards on the bottom of the deck. The second dealer also need not necessarily have to stack the deck,nullify the cut,and so on, whereas the bottom dealer has to get a stack of cards on the bottom and keep them there through false shuffles and cuts. Seconds dont even need marked cards now that I think about it.Merely peeking at the top card is effective enough. And to wrap it up second dealers can have a naturalness bottom dealers have a hard time to achieve.And naturalness is crucial at the table. And the bottom will always have that tell tale swish no matter how good that cellar man is.Ive caught that sound from very accomplished mechanics.An example I could give you guys are Dan and Dave on time warp. An amazing bottom deal but the swish is noticeable. The Bottom deal is great no question of it,but it is greatly ovverated and second dealing drastically underrated.