Tony Vargas
Legend
Many years ago, I was commitedly ES@1, and faced with needing to add new players to a long-established campaign. After some discussion, I ended up starting the new players at 1, having some of the existing players who's characters were well ahead in exp for various reasons start 'secondary' characters at 1st, and leaving one player who was lagging the other his existing (fighter/magic-user/thief, so /very/ slowly advancing at that point) character. With one higher-level character helping them out, the new party rocketed to adequate level to join the main group with no PC deaths, yet the new characters did have some chance to develop. They also completed a reasonably good story arc starting with hunting vermin in a city's catacomb, and ending with uncovering and defeating an ancient outlaw cult of a God of Hate.And note: I am not talking about being 2 levels below the rest of the party. I'm talking about being 8 or 12 or more levels below the rest of the party. Sure, levels 1 to 3 level pretty quickly, but it's months and months or even a year or more of suckage when there are 12 levels between PCs.
So even huge level gaps can be worked around.