Gasol didn't play with Kobe and Shaq. He only played with Kobe.
They were never in danger of missing the playoffs. It's really not that hard to make the playoffs. More than half the teams get there. Again, this is why superstars on good teams today are totally fine missing 20 games. The Lakers lowest win % was .620 during those years, and Shaq only missed more than 22 games once (33 missed in 1999) from 1998 - 2004, and he played at an MVP level when he did play.
I totally disagree that Shaq should have been much better. He's a top 10 player all time, and literally the only thing that I know for sure would have made his career better is shooting granny FT's (which might've made him the GOAT). Again, if he worked harder between August and April, there is a damn good chance he would've been hurt for a lot of playoffs and had a much shorter career.
Wilt isn't the guy you think he was. Neither is Kareem. They are higher on the GOAT list but they are not known for being hard workers. Kareem didn't want to run for the showtime Lakers and getting him to buy in was a problem. Wilt was just showing up and dominating.
You can respect Kobe more than I can because you haven't read Three Ring Circus. The dude admitted that the sex was non-consensual and he also narc'd on Shaq to the feds saying Shaq pays women hush money for these kinds of situations. He had no idea how to treat people. Phil hated him. His teammates hated him. He was as fake as they come. He was bullying the bench players and Shaq was taking them out to dinner and buying them suits and offering to pay for their Father's funeral. Kobe had a work ethic that I can respect, but the whole package is hard to respect.