If the Lakers are going to trade Shaq for KG, they must think that Shaq's play will tail off in the next 6 years and KG's game will get better each year for the next 6. KG is 25 and just stepping into his prime. Remember that MJ won his first title at 27 and Shaq won his at 28. So, if KG joins Kobe, KG might get his very soon. Also, I think with KG, Kobe's real game will finally show up. KG does not demand the ball like Shaq demands it. KG is an all-around player, with a determination to play defense. I think he led the league in triple doubles this season. Therefore he can defer the scoring to Kobe, with KG the second option.
Reasons to make the trade:
1. KG is younger.
2. KG is stepping into his prime years, Shaq's prime is past.
3. KG is hungrier, we all doubt Shaq's desire and dedication at times.
4. My explanation above about Kobe's game and KG's game better suited for each other.
5. This trade is possible financially, with similar contracts.
Other than these reasons, don't make that trade.