The only legend I can think of for the Lakers that did not win a title is Elgin Baylor. 8 NBA Finals. 10 times All-NBA.
A revolutionary style of play. Did things that no player had ever done before. The greatest forward in league history to that point. Like 35ppg almost 20rpg as a 6-5 SF. Could handle and pass the ball like a guard. Dominate the boards like a big. One of the greatest scorers ever. What? 2nd or 3rd All-Time when he retired in scoring. Something like that. Aerial creativity and mid-air artistry never seen before that would set the foundation for future evolutionaries like C Hawkins, Dr J, David Thompson, MJ, Vince Carter.
That is what it takes to be a legend at a team like LAL or BOS without winning a title.