It was a good trade on both sides. Buckner is a great player and was double teamed at times benefiting Armstead. But with Ford and Bosa on the ends, you cant double team everyone on the Dline and Armstead will still benefit. 49ers got a 13th overall pick and locked Armstead with similar measureables and an explosive season last for 5 mil or so less a year. Colts walk away with an exceptional player. Niners can still remain dominate in the front for years to come and can supplement what they lost with a high draft pick