So by chip leader I assume you're talking tournaments? Having a big stack certainly allows one to open up their game some, but by no means do you have to be the biggest stack at the table. Just having say a 40 or 50bb stack when the average is 15-20 is enough to make some moves you can't or shouldn't make with shorter stacks. Sometimes you can 3 bet shove some pretty weak hands with shortish stacks. When the rest of the table is fighting for their tournament lives it can be pretty hard to call a 15bb shove, this is referred to as a restealing and it must be part of your arsenal. You don't have to have much but I like to at least have some kind of decent battle hand, like a pair, suited connector or broadways. With a big stack, well, now you're cookin' with grease. Nobody wants to tangle with you because you can make calls they can't. This is a great opportunity to build your stack. When a big stack (not necessarily the biggest stack) raises, the shorter stacks understand you will likely call any all-in bet under 8bb's so they're forced to either fold or put their tournament lives on the line. So, to your point, this would be a very bad time to try to bluff.