I will be very quick with this:cap space.If Lakers do the Myles Turner,Buddy Hield trade,they will be stucked to Buddy's 21 mil/year contract for the FA and they risk losing Myles in FA.If they do the Gordon Hayward trade,they are locked to a 30 mil/year player that has a injury history behind and who can be injured in the most important moments.

With this trade though,they just tie to a 13 mil/year contract that they can trade easier and 2 expiring deals.With all the cap they will clear next year,they can sign great role players and build a roster more similar to the one that won their chip and even better.Players like Bojan Bogdanovic,Serge Ibaka,Jae Crowder,Myles Turner and many others are in the next year FA.They could really help them build a great contender team.

Also,this trade gives them some spacing and a great starting quality center,that can ease AD's defensive work.